Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad525b384b19c83a…

MALICIOUS

PDF

69.7 KB Created: 2020-11-29 19:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83274a9a3b37bd8a0d1b20b61b54e1ec SHA-1: 152c1786133e9a5ef8e45ca32e594bc091704f4c SHA-256: ad525b384b19c83a6774a6c17d2a4afeb6b3ee7adaba76117dfe0c2fc5910060
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The presence of a URL like 'https://trafficel.ru/123?utm_term=unblocked+3d+games' indicates a lure to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/123?utm_term=unblocked+3d+games
    • https://kabudededawizo.weebly.com/uploads/1/3/1/3/131383409/8644275.pdf
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/vovofofaverun_sawivurovoj_nifawubazox.pdf
    • https://wetivaxidufe.weebly.com/uploads/1/3/4/8/134891283/7501867.pdf
    • https://gokivasinu.weebly.com/uploads/1/3/4/3/134334496/9106000.pdf
    • https://dadoxagowona.weebly.com/uploads/1/3/4/6/134677816/relevepamufinusijusi.pdf
    • https://wazajatagif.weebly.com/uploads/1/3/4/3/134376275/lujav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bitajemisajoz/egypt_budget_2018_19.pdf
    • https://s3.amazonaws.com/fosalizuzu/86757526192.pdf
    • https://uploads.strikinglycdn.com/files/50dae537-4bcf-48e9-9650-032a3bce4190/nordic_ware_indoor_stovetop_kettle_smoker.pdf
    • https://s3.amazonaws.com/zolerazowubow/mandated_reporter_california_off_duty.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_off0000d334.bin
4b01ec9a2a9b067d4de7778f75c851f5acb154edaa046276ff14295128fbfab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 5524 bytes
font_01_sfnt_off0000e5ea.bin
01fcea0366a1a2d2eb61ac0ea059d75504b5ac69afc6990359d0e9536a8a629e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 10280 bytes

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