Malicious PDF — malware analysis report

Static analysis result for SHA-256 200dec424a08d39b…

MALICIOUS

PDF

97.8 KB Created: 2021-04-14 06:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3dca5e2d77afd386a886e6ecc90563e SHA-1: 431d6b011d373c0b61545914970f6297a1bc53e5 SHA-256: 200dec424a08d39bb1eb2d4bb6e569c794b589e7f11fa218956b6f5763128d13
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or spamming intent. It contains numerous external links, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://botokaw.ru/strik?utm_term=how+to+adjust+depth+on+bostitch+nail+gun
    • https://cdn-cms.f-static.net/uploads/4408713/normal_5fea2400ca570.pdf
    • http://zitugaxusi.mygamesonline.org/56606180566.pdf
    • https://cdn-cms.f-static.net/uploads/4449618/normal_601661f51cbd8.pdf
    • http://thepropheticapp.com/surovekurotetulna9sd.pdf
    • https://cdn-cms.f-static.net/uploads/4367304/normal_6059fc0030f29.pdf
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5ff27fe394f73.pdf
    • https://cdn.sqhk.co/luwibajik/dBhcb9A/voxepixag.pdf
    • https://static.s123-cdn-static.com/uploads/4407304/normal_5fc834553dd11.pdf
    • https://cdn-cms.f-static.net/uploads/4471092/normal_600b1e233494d.pdf
    • https://cdn.sqhk.co/giboxikewev/hdzLhbS/kurigatonibevapimiso.pdf
    • https://cdn.sqhk.co/nisavivurefu/jghbVjb/the_escapists_2_achievement_guide.pdf
    • https://bofejaximolapob.weebly.com/uploads/1/3/4/7/134751884/solunal-xojevaje-jineval.pdf
    • http://prizinsta.site/82374558721d8rhh.pdf
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/kuxip.pdf
    • https://cdn-cms.f-static.net/uploads/4469836/normal_601f268385032.pdf
    • https://jufufowepum.weebly.com/uploads/1/3/5/3/135348100/4937249.pdf
    • https://cdn-cms.f-static.net/uploads/4527357/normal_603bc7307e8e8.pdf
    • https://cdn.sqhk.co/raguwubives/lujagcy/kukutonalironok.pdf
    • http://jiwapadenejeza.getenjoyment.net/gezekotaritepuwugoguvepo.pdf
    • https://cdn.sqhk.co/nukunudakiju/gyhjmia/13850675385.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vutogebufuz.myartsonline.com/developing_marketing_strategies_and_plans_kotler.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_off00013a88.bin
ed7d3636645766b1a329dd27a945c5979ca241d4d355353c53d3d4ae78a48e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A88 5508 bytes
font_01_sfnt_off00014d55.bin
9a0366e1b32a68e46848ba59a1c5c9807136e41b19be4f160945d956f38cea2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D55 13304 bytes

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