Malicious PDF — malware analysis report

Static analysis result for SHA-256 3979c2712f9a344f…

MALICIOUS

PDF

78.3 KB Created: 2021-05-18 23:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8915f09d692b662c813d8553ec3c0580 SHA-1: ddafced9532849d3f2e8ee68a2dba1ddb01430ed SHA-256: 3979c2712f9a344fb14c6ae3b3276b7ee3045adbaf6490409e680bbc20dca77c
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with critical heuristics indicating it is part of a link farm hosted on disposable domains. The document body, though heavily obfuscated, contains text related to promotional codes, suggesting a lure. The presence of numerous external links, including one to `botokaw.ru`, indicates an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=what+is+kohls+30+off+promo+code
    • http://fewomazojuxed.iblogger.org/xakemiwomefuvojukapazu.pdf
    • https://cdn-cms.f-static.net/uploads/4371005/normal_601cfaf889c37.pdf
    • https://cdn-cms.f-static.net/uploads/4374686/normal_603d36aea4382.pdf
    • https://cdn-cms.f-static.net/uploads/4404987/normal_603c0bd63f8c5.pdf
    • https://vimasavugaf.weebly.com/uploads/1/3/4/5/134587410/3f7d2648001570a.pdf
    • https://wixefonimav.weebly.com/uploads/1/3/1/4/131437632/tepokowukijonosez.pdf
    • https://cdn-cms.f-static.net/uploads/4446650/normal_605327cd76fc5.pdf
    • https://naxulukituno.weebly.com/uploads/1/3/4/8/134879135/gabedurelapavu_dakesililu_gejimadasug_sonuxe.pdf
    • https://xunowivoratidom.weebly.com/uploads/1/3/1/6/131636824/vovejekemirij-fopaz.pdf
    • https://guwuribi.weebly.com/uploads/1/3/0/8/130873976/vopagaguzaxowep.pdf
    • https://static.s123-cdn-static.com/uploads/4459917/normal_5ff1df4bf1049.pdf
    • https://vamewifajezik.weebly.com/uploads/1/3/5/2/135297159/1d9bf70b.pdf
    • https://xidamosu.weebly.com/uploads/1/3/4/7/134707329/8108122.pdf
    • https://jugafuxuxeg.weebly.com/uploads/1/3/2/7/132740719/xonewigozi_ribuze_lomolilotimox_mekebajenuxoda.pdf
    • https://static.s123-cdn-static.com/uploads/4366347/normal_6006fa67f2df6.pdf
    • https://static.s123-cdn-static.com/uploads/4490269/normal_5fe057e998fa4.pdf
    • https://kawuruli.weebly.com/uploads/1/3/0/8/130814241/zeribu.pdf
    • https://gomosoganerat.weebly.com/uploads/1/3/4/4/134494513/palubelexalim-dukomugisiduj-gokefidopo-zikugikarobo.pdf
    • https://static.s123-cdn-static.com/uploads/4470542/normal_60061dec9e1f3.pdf
    • https://cdn-cms.f-static.net/uploads/4471690/normal_60186adf928e0.pdf
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fe47080437a5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5993d809-9b61-4ee9-86c2-a3f22fdcb95f/how_to_use_hx_stomp_looper.pdf
    • https://uploads.strikinglycdn.com/files/4f2718b3-5501-468a-99e0-198890a50656/bojaxasagisasami.pdf
    • http://xujijanuzovaziv.rf.gd/minecraft_skin_girl.pdf
    • https://uploads.strikinglycdn.com/files/308b72c8-8d25-4243-a7d7-8453643d695b/how_much_is_my_new_home_sewing_machine_worth.pdf
    • https://uploads.strikinglycdn.com/files/c1c76b38-87a9-4c04-9195-c5dd56f4d5af/what_is_an_opportunity_statement_examples.pdf
    • https://uploads.strikinglycdn.com/files/ada902c1-1da6-4527-bdb0-70a7ee179042/26135198179.pdf
    • http://jaluwapuleg.epizy.com/old_letter_template_ks2.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_off0000f0b7.bin
563cd523b8ec12eb8fae4dfedf292477c0a79a048f2602b524285ec24de0cd36
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 5776 bytes
font_01_sfnt_off00010448.bin
4f3d7c2e2f6ec32f4f94973c8b73d8222460f7f6735ee0a855674cf99284ef0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10448 11304 bytes