Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a5cf38829529e3…

MALICIOUS

PDF

84.0 KB Created: 2020-11-18 04:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f054a6dbd3d98f5890e17600a6b914ac SHA-1: c03fa2071d025e52db848e2d6ddd157801865e31 SHA-256: 27a5cf38829529e37403170640aef07def5f41e2b9f8c4b6422c6d9c4d6d22de
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document containing a large number of embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to drive traffic to malicious sites. No scripts were extracted, but the presence of numerous links points to a content-based attack.

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://ggtraff.ru/123?utm_term=cackling+hags+blouse In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426088/normal_5fb2e63739891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412160/normal_5f95b8d562f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f97feaaa8b4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5fb25c9946d23.pdfIn PDF document text
    • https://paduzegisenulun.weebly.com/uploads/1/3/4/6/134665595/tofirexitofef.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/mujevubutukoxu/47672918158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4235d35-4513-4aa4-bb35-a3bfcf4b4a49/zojegazorufawoxidonaja.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/48439009646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b5d5722-06c3-44e2-a9e3-547f47f2a51a/vafugunibabuzepakusiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/marketing_is_all_around_us_chapter_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/advantages_of_solar_energy.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/twelve_votive_figures.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0B 5072 bytes
SHA-256: df578052bd77d2cff6f379a91c712242f6b529d67e2dde04f8abe27ea77f23a8
font_01_sfnt_off00011d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4C 11236 bytes
SHA-256: 2cf097a6953853c7e8c29f16a4af62d9a79b87a1c0477c2df51e2303385e5dcf

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