Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6db21de7dc215e0…

MALICIOUS

PDF

69.7 KB Created: 2021-03-19 05:21:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daf14c66a680b24673752876eb32dbff SHA-1: 70cd2c5e12723fbacf0c5eb91d07594029f12e68 SHA-256: b6db21de7dc215e0dd75f077f3508b4cc3553f315455c206a87c8a843415c342
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, suggesting a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=holt+mcdougal+biology+florida+textbook+pdf
    • https://cdn-cms.f-static.net/uploads/4476582/normal_604b6ce178db4.pdf
    • http://pupofikavize.iblogger.org/94085520938.pdf
    • https://cdn-cms.f-static.net/uploads/4409238/normal_60463b962396a.pdf
    • https://cdn-cms.f-static.net/uploads/4462341/normal_602465b8d472e.pdf
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fdd7231232ca.pdf
    • https://cdn-cms.f-static.net/uploads/4461773/normal_6035cffc49979.pdf
    • http://wadigajore.22web.org/honda_eu2000_parts_diagram.pdf
    • https://cdn-cms.f-static.net/uploads/4385207/normal_6009b04a0cc60.pdf
    • https://cdn-cms.f-static.net/uploads/4371495/normal_603e465645714.pdf
    • http://bivebojulop.iblogger.org/4955082432.pdf
    • https://static.s123-cdn-static.com/uploads/4484093/normal_5ffc30ae5f3f1.pdf
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd1cbedb0c4d.pdf
    • https://cdn-cms.f-static.net/uploads/4489583/normal_60393cc1a1d83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_2a03d88f4465465abf579e6bfb07f7c2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/50ab9685-998f-4cc1-822b-ec530ea2f4ab/75422054381.pdf
    • https://uploads.strikinglycdn.com/files/811cc340-e2c2-4534-a36b-4dd1af0fefac/how_to_do_day_trading_without_25k.pdf
    • https://9a89a7da-ede3-42eb-a537-7416be21eb2d.filesusr.com/ugd/aaaf79_d593a7a2282e4e9988818a1a2d8b3b2c.pdf?index=true
    • 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_off0000d0b0.bin
fb14372e91cac90ce16a054408499ae6a403a0a12790c6facd6901fa4b5b6431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 5632 bytes
font_01_sfnt_off0000e3ce.bin
7b193f14bd41ad7e6012cc0bb5008981e0ff691eacb818af215766e91735e299		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 10476 bytes

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