Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e216c0fed0b1db1…

MALICIOUS

PDF

83.9 KB Created: 2020-11-13 13:27:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 06e1c496c81c2e387ba4931e9603e19f SHA-1: 1f8f194453a5f63138673fba1e2676376fdbbb1a SHA-256: 5e216c0fed0b1db165ef32ec242489803b7fe1bd197d4c03ff3eaad8e333b49c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/123?utm_term=autobuses+ama+pr In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411696/normal_5f9c780e5cbff.pdfIn PDF document text
    • https://bupaduzisi.weebly.com/uploads/1/3/4/4/134475958/6785499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5f8d6f760c23f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f88791077d1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_5fad5af03a1bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5fa50960202b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_5fad67a827f53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f929237152e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wilugugo/bixafa.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/international_marketing_books.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/band_quotes_funny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5842ec6-19fc-4331-86ca-5e17de5b40ff/64566185740.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/free_android_recovery_software_no_root.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/15274225339.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/upper_back_physiology.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 5064 bytes
SHA-256: 5e544a25068e608471f6f553435421ac797d5ff93c0827c7944890fc45ce1300
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 13928 bytes
SHA-256: b270918440f483658426661e8d969a24b48f40824bea9335e380fdddb1dec1e0
font_02_sfnt_off00012b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 16216 bytes
SHA-256: c4dbace8ac360c5e3b1131c3f8158b520cca7bef0f1dfbebcadc3be3e9aa265d

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