Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9970b7b3812b5c7…

MALICIOUS

PDF

63.1 KB Created: 2020-12-04 17:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8e839d8cc24161d65c81d5958373add7 SHA-1: 981009a823e3e4e68c6a58a2b93b95c9dd16e143 SHA-256: d9970b7b3812b5c7a187e68c42985027a9f45fbf5be68bab5dbfa54db745edd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with external URIs pointing to suspicious domains. The document body, though heavily obfuscated, suggests a lure related to 'Ib chemistry hl past papers november 2015', likely intended to trick users into visiting malicious URLs for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafffi.ru/123?utm_term=ib+chemistry+hl+past+papers+november+2015 PDF link annotation
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f96ec074cb5a.pdfIn PDF document text
    • https://rereviraret.weebly.com/uploads/1/3/4/5/134512362/juvibodivedaxajubezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5f8de68874bef.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_5f8c8c07c70f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5f9b80c0176ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5fc551abf3a50.pdfIn PDF document text
    • https://lunilipop.weebly.com/uploads/1/3/4/7/134745285/figegagafore_dosozipanej.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/timeziso/nativity_of_our_savior_school.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f186bda9c57a97be6d6b/t/5fc19e3e08845d0924c7ae58/1606524478985/lobonopi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/calculus_of_variations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98ff8445-2e43-48ac-8bb8-141c320e57b0/2b2t_starter_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf553ca97599144eee4ae3/1606374718158/linevajefe.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_off0000b81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81C 5860 bytes
SHA-256: c4d01a943da9a6b45025071354ed67c3bb88e9a3c34e311725c2df408216dbce
font_01_sfnt_off0000cbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF5 10512 bytes
SHA-256: 596485678b274ce99ea5e1e01719f15f5a46ad93d41cd1fec6d66ef84ade2c33

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