Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46bd4a42b4f1424…

MALICIOUS

PDF

66.7 KB Created: 2020-11-19 00:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3c7c401f6484c26f2c46a2bbf81058d SHA-1: 9d05fb3fa62fa722c47d0907ca4c4244a4e90cab SHA-256: c46bd4a42b4f1424a0a3c878187a14d6be11b470ce19fc8323d94acd3b52cd0c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to disposable hosting services like Weebly. This behavior is characteristic of SEO spam or a phishing campaign designed to lure users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=war+is+kind+analysis+pdf
    • https://levibuzoj.weebly.com/uploads/1/3/4/4/134444272/0214e097cd36e6.pdf
    • https://zowupenejanelaw.weebly.com/uploads/1/3/4/3/134397621/vuxoxogofixure_wariwegovu_jebide_jasugogaxa.pdf
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/916016.pdf
    • https://zekenegelu.weebly.com/uploads/1/3/4/3/134390475/5946263.pdf
    • https://didavetamij.weebly.com/uploads/1/3/4/3/134320859/tetavoze.pdf
    • https://vilomaranetuxer.weebly.com/uploads/1/3/4/5/134502128/biwojupoxozof.pdf
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/texagifopop_zuxejoxekexali.pdf
    • https://nuzolegan.weebly.com/uploads/1/3/4/5/134576582/narawa.pdf
    • https://rimesozarabef.weebly.com/uploads/1/3/1/6/131607712/xananovetivagizaxa.pdf
    • https://bosesabefo.weebly.com/uploads/1/3/4/3/134362720/jetoxebodupufopopo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lekizopiloref/costco_executive_coupons_january_2020.pdf
    • https://uploads.strikinglycdn.com/files/a45ef21a-045d-4b55-a08b-39eef78d4fee/nopojivijiv.pdf
    • https://uploads.strikinglycdn.com/files/fb8f92ec-29dc-4ecb-abf6-cc911dac155b/70652590675.pdf
    • https://s3.amazonaws.com/xarojapi/biomedical_technician_job_description.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_off0000ca89.bin
433d18ab94d45afe41c3423f1ad338a2add3593e724aea1154dd12b4cb3536d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA89 5212 bytes
font_01_sfnt_off0000dc6e.bin
bf5fbc7935eed794e0e4167eb9119c6a9e7d28a63748b6637578a7cdee41614c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 10016 bytes

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