Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf80c9df9f5e51e6…

MALICIOUS

PDF

81.2 KB Created: 2021-03-28 01:29:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c14da3d606e64c1a524b0c430ad37cfd SHA-1: ca274d2ebe1d40eba6743b5cf5c5a25b444212d9 SHA-256: bf80c9df9f5e51e67914476cf1b62cab91618d04f5bbd79916744b81c4ea1dd6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/123?utm_term=apush+chapter+12+short+answer+questions PDF link annotation
    • http://retys.fun/gadiwekekidaogey.pdfIn PDF document text
    • http://podcard2020.site/98297349545vmxe4.pdfIn PDF document text
    • http://copyright-rules-help.com/gimp_2.8_2_user_manual_downloadwadlt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_6d6f6af6eb6c4dc1a3205875196733ab.pdf?index=trueIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_07b866b04c59499ebf4091781fb437ab.pdf?index=trueIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_c3eec01cfe66450fa011841cc63382db.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_33d43b5dec5e4b1c88ec5431a7b202aa.pdf?index=trueIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_2cda75c21ddf441fa0a805fb654e89a5.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_b8c09430651f487180bbccf414ba5526.pdf?index=trueIn PDF document text
    • http://zijevaru.rf.gd/egyptian_comfort_1200_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e61438-eee9-4643-9486-cf0a3e4e0fc4/dell_latitude_e7450_power_cable.pdfIn PDF document text
    • http://bilexijo.rf.gd/loudermilk_season_2_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4a36e2-5580-48d8-9ae9-8522c8254f13/kunotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee5e83b-5976-49a3-8bcd-e4534826042d/list_of_si_units_in_physics_in_hindi.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_ed3829a3baa44fb88d005611ebdee9c7.pdf?index=trueIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_cfcd6b11d1684fa9b379bd42633c27f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f23f13b-9b51-41f9-bf75-94fb32c0d269/quick_and_easy_dinner_meals_for_picky_eaters.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_9be9927ed665417dadc32e9b1e8a79b5.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_86547af5784a4006b14db5f5c80dda6a.pdf?index=trueIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_9dc1965763b34a3ea848fa3deb8d2fb4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6fcb95a-c638-4428-b367-27a780a43a76/what_kind_of_diet_is_best_for_endomorph.pdfIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_982d8d423ec64576a94f4a34af540c92.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_7b3c7734c2af4524968d57d7aa432097.pdf?index=trueIn 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_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 5380 bytes
SHA-256: cbda27baea29cc089daaa3d6b007c21847c24f19e4dbf16fd3aaea308c4105ce
font_01_sfnt_off000112fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FC 10656 bytes
SHA-256: 99e651a728bff1b2274b79998f9e1e2be950642ccae7371ec49a05612b163410

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