Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a093992bd1dac4…

MALICIOUS

PDF

72.8 KB Created: 2021-05-31 22:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14866da47338d37dfc9ccf1d59e54503 SHA-1: 9d00340d0dd92edd88207af3d4d9b5ffb3738fee SHA-256: c1a093992bd1dac403a2b819b74f047c285caa9f7622a736ab4c08f8261fbbc2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF documents, suggesting a link farm for SEO manipulation or to host malicious content. The primary URL, 'https://infrive.ru/pbw?utm_term=wifi+hacker+pldt+apk+free+download', indicates a phishing or malware distribution lure related to downloading a WiFi hacking tool. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/pbw?utm_term=wifi+hacker+pldt+apk+free+download
    • https://cdn-cms.f-static.net/uploads/4412377/normal_5fe812a935f24.pdf
    • https://cdn-cms.f-static.net/uploads/4390056/normal_6069917f8e92f.pdf
    • https://kinimozudex.weebly.com/uploads/1/3/4/4/134498073/ec3ff4feba55ec8.pdf
    • https://cdn-cms.f-static.net/uploads/4410018/normal_603a8cfe6c13c.pdf
    • https://cdn-cms.f-static.net/uploads/4368225/normal_605f561e745a3.pdf
    • https://nepefesin.weebly.com/uploads/1/3/1/4/131410606/89d1735b6ec7f0b.pdf
    • https://fiwisiroveton.weebly.com/uploads/1/3/4/3/134339953/petowajexamapada.pdf
    • https://static.s123-cdn-static.com/uploads/4446263/normal_5ff05e2fe21a9.pdf
    • https://cdn-cms.f-static.net/uploads/4485322/normal_601c6a1139b3c.pdf
    • https://static.s123-cdn-static.com/uploads/4463552/normal_5fc7265887c77.pdf
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/wonod.pdf
    • https://cdn-cms.f-static.net/uploads/4408706/normal_603f81409f8da.pdf
    • https://vefawotujetebab.weebly.com/uploads/1/3/4/6/134651081/9452212.pdf
    • https://static.s123-cdn-static.com/uploads/4464072/normal_5ff05c6aa276b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gifavipa.pbworks.com/f/13431116996.pdf
    • http://wejojixi.pbworks.com/f/passive_voice_past_continuous_tense_exercises.pdf
    • http://xuruzinijub.pbworks.com/f/baudrillard_simulacra_and_simulation_disneyland.pdf
    • http://mosijiv.pbworks.com/f/kingroot_apk_download_latest_version_2020.pdf
    • http://jumedew.pbworks.com/f/jexotozetovofowugudigeba.pdf
    • http://wamotarirup.pbworks.com/w/file/fetch/144422865/60025668458.pdf
    • http://bupataved.pbworks.com/f/noxoradizudobapaduwew.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_off0000e02d.bin
334fcef6fe073a9d6bc596486c3bd9251b7c662547fdc706472a91cebf8f9d15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 5236 bytes
font_01_sfnt_off0000f213.bin
d10410e10713a8b70bacdff46efb36ca4b9ca9825e89da2165fdf070d198c6a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 10472 bytes

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