Malicious PDF — malware analysis report

Static analysis result for SHA-256 11412d037a5bf822…

MALICIOUS

PDF

69.8 KB Created: 2020-12-08 08:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c8bbf34f7c9489682169a3870806dbfd SHA-1: 1a4dd0314d37c0d088cc708e8df9df48d03b7ccb SHA-256: 11412d037a5bf82263956a6a2da3ea4cedaae90433f4369e1f2b3a5fa3eb13cc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to artificially boost search engine rankings. One prominent URL, 'https://trafffe.ru/strik?utm_term=read+last+sacrifice+online+free', suggests a lure to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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://trafffe.ru/strik?utm_term=read+last+sacrifice+online+free PDF link annotation
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/4566434.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/cb2e43f87ef0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f891bf29e6b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452376/normal_5fbc9c797ca9f.pdfIn PDF document text
    • https://latavulepa.weebly.com/uploads/1/3/4/4/134461708/divop_musew_bejibu_xibukaxaxubiwap.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/7376165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452152/normal_5fa1c6cede65e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc10620bf71053ccb10dd13/t/5fc168b7e18c5c478e30e15e/1606510777946/cabbage_juice_recipe_blender.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc70c64f2297e36a9fc4e22/t/5fcb213fa51c5a1401a4cc63/1607147839460/demolition_derby_2_game_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/legion_tv_show_parents_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc582ceea4a794d56647062/t/5fceeeaa68c18617d4051c85/1607397034589/zombie_apocalypse_2_unblocked_6969.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5bdee18c5c478ef35ce2/1606376414703/1998_applied_practice_heart_of_darkness_answer_key.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2a5b42e537a05ef144f11/t/5fc778f1a3696915e226a079/1606908150051/gizoxujofevimu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4da018e72e5fdbce0b85/1606372769297/minecraft_crossbow_enchantments.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc111025e8e827d428ec193/t/5fc81eecec83506b046d5b61/1606950637164/neet_challenger_aakash_app.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_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 5020 bytes
SHA-256: 1d812cb3bdf3a6aaaca5e4bc14e18a4f5309a07621813adc93b9f5bede86091d
font_01_sfnt_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 10496 bytes
SHA-256: ec1228a99ff2ccc3f7c56e47a85da90889bbece884eb14eb2bfe9e93e3edffee

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