Malicious PDF — malware analysis report

Static analysis result for SHA-256 8813c87ea01c9888…

MALICIOUS

PDF

95.4 KB Created: 2020-12-16 16:01:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 30ed019f11a0eb092ea7e3cb44ee0b2e SHA-1: 44528208af6014123794889835ee3b5ffdf3d7c7 SHA-256: 8813c87ea01c98880ea97c257403ce60f57ad4b9c0e81a2ea51e046996732c1f
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to disposable hosting or redirectors, indicating a link farm designed to distribute traffic to potentially malicious sites. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and ClamAV detection further supports its malicious nature. The document body, though heavily obfuscated, appears to be a lure related to definitions, likely to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/aws?utm_term=definition+for+the+word+bimanual In PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/e702a448eaea0c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495999/normal_5fc1d6ad6f467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_5f8ac34f74cf2.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/8c88432f680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468534/normal_5fb7e74e7c8b9.pdfIn PDF document text
    • https://desaviguwogo.weebly.com/uploads/1/3/1/8/131871994/04abd1.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/paralavosezoxekularu.pdfIn PDF document text
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/gatuwidaxemobibozamu.pdfIn PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/mowasile.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/zopapedokagawat-dowumepopiwig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372987/normal_5fcaa86b0b794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470683/normal_5fc52e98a3247.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/ruxikopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492246/normal_5fd5f15dcbbed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/japan_information_network.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 4484 bytes
SHA-256: 88ed02dc3479cc38b75da52e90e1c03889ece03acfaca1ca0ccae6ac56136f5f
font_01_sfnt_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 5200 bytes
SHA-256: 80f375afc4ca403ee72449e92355b7c030c7cf89155d87fc3a91be36d95c9b33
font_02_sfnt_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 2656 bytes
SHA-256: ff8289fcab20b7b81f5dc7c47458689637225d7099c48932a46d6898d6123f6c
font_03_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 2328 bytes
SHA-256: 18b250f24057ce91e4a59b25c1eec79fa8b4d7e2cb9f6c0de02c7e032a072fd4
font_04_sfnt_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 2108 bytes
SHA-256: 5fc9e2cd4e7ad04544edda2023dd698132b65daf167a61e09de9fd8de66d8b52
font_05_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 6244 bytes
SHA-256: aa27ff5f55262cfa566fa9394baad46dc5c31bf2191e33a98eef31acc5d2fa9e
font_06_sfnt_off00011cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC3 14668 bytes
SHA-256: 5924b03f2fe0f27c6e206f32592e4822a3627b8c3fc993756c5bf6fa45490138
font_07_sfnt_off00014993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14993 16652 bytes
SHA-256: 30d4b1b28197c00957822bcda8af71b9a468fed555271cc7d86bc51c35a10e34
font_08_sfnt_off000160c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C2 3276 bytes
SHA-256: 36e71c95d3b6602ce175a98ac99a2c18c99235fab0e24c6c46ec4ff9e72f8c94

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