Malicious PDF — malware analysis report

Static analysis result for SHA-256 f456fcea6baaa96e…

MALICIOUS

PDF

76.5 KB Created: 2021-03-28 16:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6772b515075a0797f2550ff508862c57 SHA-1: 614ca01f72d85389b77f8fd5ac0a6d09b11c1e79 SHA-256: f456fcea6baaa96e404f97f986777bc23e13867a5cccbdf87a1c862181db30f5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers identified this as a malicious phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/award?keyword=acquisitions+incorporated+5e+pdf+download PDF link annotation
    • https://cdn.sqhk.co/befozaxulot/ddhZja7/kunewomepufasepamesuranu.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/jggiehi/kisemulawix.pdfIn PDF document text
    • https://cdn.sqhk.co/tagodepa/iplsgeN/92699853788.pdfIn PDF document text
    • https://duparumiwope.weebly.com/uploads/1/3/4/7/134707207/d50c3673.pdfIn PDF document text
    • https://ponefapu.weebly.com/uploads/1/3/1/6/131637257/ebad75.pdfIn PDF document text
    • https://rusijarumeza.weebly.com/uploads/1/3/1/8/131871651/wivija_rozamojufoluve.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/K7ijvhd/youtube_music_playlist_oldies_70s.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/IQjaxjA/midexakezadawup.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/aieAxih/kung_fu_tea_near_me_hours.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/xoxirujogalunav.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwolegu/hhNboii/fuzazagugoga.pdfIn PDF document text
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/3593861.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jJRTaia/auto_change_wallpaper_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_96f8e8ae984b4a539f259f5585b3e52a.pdf?index=trueIn PDF document text
    • http://pawuzax.onlinewebshop.net/72447213795.pdfIn PDF document text
    • http://vesedakowata.onlinewebshop.net/60778044253.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_21aa735180ef4ce7adeca9ad6d49c746.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_7b5c76c8ca6047ad9f0f244746782b0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/beethoven_piano_sonata_no_1.pdfIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_a0f032e453664eaba460a3a0ae383fb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/golozejexam.pdfIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_966aed27eeb546f1a80069997ec6c0dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/pulmonary_arterial_hypertension_guidelines_2016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD07 5364 bytes
SHA-256: f85a82b5ff1460e4648c9ea54fa20036c29adc3d7ce2031e7793324e83c90a93
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 11456 bytes
SHA-256: e2c813e737188f1d5a55c79762745b8b3cd601ae8a260b87b362dc312c69c325
font_02_sfnt_off00011666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11666 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3