Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d19c5bde3087db…

MALICIOUS

PDF

67.9 KB Created: 2020-12-15 12:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: fea2e884a27a02fc3bc7c936ca9e56c9 SHA-1: 25f6a35e6ed26d05b99dce77d061b31ff06a289c SHA-256: a0d19c5bde3087db25da58fadcd048f72f2bfb678f626f374f73e60cd783848e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. One of the extracted URLs, 'https://traffnew.ru/123?utm_term=little+man+computer+multiplication', appears to be the primary lure. While no scripts were explicitly extracted, the PDF_URI heuristic and the nature of link farms often involve embedded JavaScript for redirection or obfuscation. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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://traffnew.ru/123?utm_term=little+man+computer+multiplication PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5f99d7ea52766.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/074bebbc461f.pdfIn PDF document text
    • https://luxovifawus.weebly.com/uploads/1/3/4/3/134341193/takasofu-bavibofogexe-velos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459318/normal_5fa8768e5cfdb.pdfIn PDF document text
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/883409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f998824acb78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5fbbba037475a.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/1881054.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/zamuriza/khadya_nagrik_aapurti_vibhag_mp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e824394f-fa27-4e26-a963-0e0fc8493f69/16847764393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c7c18d7-2625-4c4b-842b-a46fee8af1e9/fuvawunupewujijidatovug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f28c22a-1525-4002-add7-3bd37fd92707/meturewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc0176c-2caa-4d00-a3fd-ed2dde29a2d1/kirobas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5234a8-e404-4a67-9021-b5c6c6f00526/sunbeam_alpine_serie_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20de205b-6c3c-4a0a-9ad6-eafb3af2d29c/american_saddlebred_horses.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_off0000ceeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEB 4844 bytes
SHA-256: 0f303729d9e6627f7dd3656d3a33268128419559d5a21ce50094d41714858be1
font_01_sfnt_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 10280 bytes
SHA-256: e91979a6d482e5cf78e3b8ead89ebbb4bba976fedb5b520778cefca4f38c255a

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