Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31d4d1cdbd03e61…

MALICIOUS

PDF

85.7 KB Created: 2021-05-06 07:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9128dd76be085c80f2359386d0cfd84 SHA-1: e10284f1276096409ae94b18cc4d6a4ec45bb11b SHA-256: b31d4d1cdbd03e619e3cf5919a4ffa407b7649ef2de859b09529cc1fdd386358
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged as a link farm. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://zajinet.ru/strik?utm_term=how+to+treat+autism+spectrum+disorder
    • http://voicebftyi.com/posotoxejuwopazawufcrtqc.pdf
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5fdbe20e34c49.pdf
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fd31415f395a.pdf
    • http://wowmarket.info/16875871157vvn8r.pdf
    • http://custits.space/zokasuragebexuxynrxr.pdf
    • http://hdvideo.design/joes_crab_shack_menu_pricesocqwy.pdf
    • http://cardio-active.site/lopenojoxedajovamukulo8yot6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/29548b15-851b-4578-b8e1-c2ea08e240d4/gulodekesiluralemo.pdf
    • https://b304dada-1952-41b2-af44-d16a3232bb3f.filesusr.com/ugd/c19c34_53b656fe3c8a43a69c3de6bdf82fa2d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7b7f4fbf-0f4c-47fe-824a-964e2f5f0c1c/kupuk.pdf
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_d1d81ae79dee4aba9a6db3a900de4738.pdf?index=true
    • http://kexobub.rf.gd/80965430961.pdf
    • http://bobamexexaru.rf.gd/msds_sheet_for_clorox_bleach_foamer.pdf
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_54586251511145b2a159e699170b210f.pdf?index=true
    • https://s3.amazonaws.com/zetituri/fafuwiralulonuvu.pdf
    • http://zazozipuse.rf.gd/sindrom_asherman_adalah.pdf
    • https://uploads.strikinglycdn.com/files/165b585b-f973-4a8c-980b-70f712d6f139/lenugotozemozatoj.pdf
    • https://s3.amazonaws.com/xowasosuf/43769976620.pdf
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_221b774850094d2f845e2aee8f5b14a3.pdf?index=true
    • https://s3.amazonaws.com/legapatatezisa/latizus.pdf
    • https://uploads.strikinglycdn.com/files/bcf19d9e-3f94-4bc5-8334-a8d48bce676d/dell_ax510_sound_bar_specs.pdf
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_5012f57d74324d7289ad0450e85ad9fa.pdf?index=true
    • https://s3.amazonaws.com/bitajemisajoz/free_floor_plan_software.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ee4f.bin
1d7b8c4240636c29100a4f60ea5ccd301c3465861c3fd1b4b5a1f1e2f7c7ee86		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEE4F 10300 bytes
font_01_sfnt_off00011002.bin
ce6e05644fd7712849954e0e48a2c063559610b642e34102c0ad5e7c295d038b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 5240 bytes
font_02_sfnt_off000121c7.bin
35ed2da21586ac4adb0939fcb441e19952eb0fc7dbdb20cee8d0dfa8c295c76e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 10824 bytes

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