Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a988c03eb0e5254…

MALICIOUS

PDF

60.2 KB Created: 2020-12-17 02:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 027f453eb773cf77724b288dabee22b8 SHA-1: 44d544352f786dbea66a1d0d6ec71105830de013 SHA-256: 3a988c03eb0e525453592054444676b995102aa0105af6d530e648b5f75d09ba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The embedded content, though heavily obfuscated, likely serves as a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/123?utm_term=montgomery+ward+rototiller+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388820/normal_5f8f04f91ee79.pdfIn PDF document text
    • https://bugajikiwolano.weebly.com/uploads/1/3/4/4/134471946/b5bf49c4fa4e186.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f9827438df9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_5fb69bdf95c02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f9cb66f5507b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5fd9f1e311c27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5f9108d152ef6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_5fa3bdb0d9d4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496389/normal_5fc7f1a4b3e02.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465537/normal_5fc9765fd1041.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe479662-35c9-467f-afbe-314f57bac9b8/sodawozatewuxatilaloka.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe17e61972c46e3c675815/1606293501351/74514040337.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf4a645ca4f7902655bf9/1606218918731/pudurojikevit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd7dfd9-134f-4a5c-9699-346784476b09/edenpure_classic_heater_manual.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_off0000ae1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1A 5168 bytes
SHA-256: e27ff1538987c6d6323590d44946ba9a277d3fa5a4d30abc8ecd190d2700d275
font_01_sfnt_off0000bfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB7 10044 bytes
SHA-256: 1cf48dd1e66263b09924331ba633c3f21088b291812886fe7863ae711dc08e75

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