Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a682ec3ef04ecb4…

MALICIOUS

PDF

72.5 KB Created: 2021-01-20 06:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 73476f8f77aab8c401bd85b6627f743d SHA-1: 706ea7af0e85c5479e1f4b2e64f582606bf47cb9 SHA-256: 6a682ec3ef04ecb44d5ce8ea8578e9ecfda4ccc008b7fb223b32ddef2a49cb6e
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a large number of external PDFs. Another heuristic flags a link to known malicious redirector infrastructure. While no scripts were extracted, the presence of these link farms and the malicious redirector strongly suggests an attempt to drive traffic to malicious sites, potentially for phishing or malware distribution. The ClamAV detection further supports the malicious nature of the file.

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://gettraff.ru/123?utm_term=mp4+movies+website In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_5fda042d69e7f.pdfIn PDF document text
    • https://rifituxajigibik.weebly.com/uploads/1/3/4/5/134519767/vofilepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5ff08f72636f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_5fbb91de2423e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387702/normal_5f9dbfd28a4ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_5fad7e56aecd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5fcd125b8c0b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_5fd86d7b24e31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_5fb27c00dfb71.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/gupuso/running_a_virtual_support_group.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/tongue_twisters_for_kids_a-z.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/derived_class_template_c.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/25320005897.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/barnett_demon_crossbow_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/history_of_islam_in_urdu_free_download.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_off0000dff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF1 5012 bytes
SHA-256: 0c1b9cb54f52f8d7601176b3e30b0f648d7f8e4fec27b7af2743987b51b2fe81
font_01_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 10520 bytes
SHA-256: d91635c05a5d2b8366851ca61d862b5392386f486d54f2fa4255d698e6c8f551

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