Malicious PDF — malware analysis report

Static analysis result for SHA-256 eebcd8cb16948c28…

MALICIOUS

PDF

72.0 KB Created: 2020-12-30 18:49:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a166e49003f5825d1e544738cd10626 SHA-1: 17328a59d527f1a05f7627c5d17499cd664ccb6c SHA-256: eebcd8cb16948c286836a3c063dade8a49d016fe19644d590bca0cb7e752ee15
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'Biology ecology study guide answers'. No scripts were extracted, but the presence of multiple external URIs indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://traffking.ru/123?utm_term=biology+ecology+study+guide+answers
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/vububakupus.pdf
    • https://vuterezupip.weebly.com/uploads/1/3/1/3/131380942/fapet_jitafisoliwuve_taperuxawegidoj.pdf
    • https://sisodiwitamusoz.weebly.com/uploads/1/3/2/6/132681746/2420425.pdf
    • https://dexulivixuwe.weebly.com/uploads/1/3/0/7/130739852/7782858.pdf
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/038885c85ecf8f0.pdf
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/bebijuwe.pdf
    • https://cdn.sqhk.co/fumazuri/aQigyLi/larry_miller_theatres_st_george.pdf
    • https://cdn.sqhk.co/guzunilepin/j4Cgeb3/drive_in_theatre_houston_mo.pdf
    • https://sokazavuse.weebly.com/uploads/1/3/1/3/131378988/645888b2.pdf
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/vazasagitute-rojanavivevaj-vazil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/58ff0027-6372-4ea2-a451-9a243a959b0e/27594337687.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab8.bin
705db625f39025bda235a156915cf0f5988b5c2e484442c3683a91eb44f2c3f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB8 5348 bytes
font_01_sfnt_off0000ed13.bin
bfaf99f06df89fbfa478abdf4411d962a74e3234f89ff279a11c85524b08a7f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED13 11356 bytes

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