Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0494a42e367bee…

MALICIOUS

PDF

82.8 KB Created: 2021-03-17 22:21:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbdb19d059083188668bc8ba080b0291 SHA-1: 7ca3cb361508b3b01c292b8acaa115cc5b7e8eeb SHA-256: 3b0494a42e367beed0ccdb4e4344e2b7759583c41c198b80fe2ce1bd1e1a3cbf
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a domain associated with link farming and potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or scamming purposes. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=ukulele+chords+easy+pdf
    • https://vafoxerosasajox.weebly.com/uploads/1/3/5/3/135398531/43edb3040258.pdf
    • https://fewidugokejif.weebly.com/uploads/1/3/4/8/134895907/xizirobo.pdf
    • https://lisebilapuwuw.weebly.com/uploads/1/3/4/0/134096741/9629833.pdf
    • https://vidowenabep.weebly.com/uploads/1/3/5/3/135322196/3575904.pdf
    • https://mesubepivugegej.weebly.com/uploads/1/3/2/6/132682347/kanajezo.pdf
    • https://regurawuxafedan.weebly.com/uploads/1/3/0/7/130740517/rosiwomabil.pdf
    • https://sawawinuta.weebly.com/uploads/1/3/1/6/131606003/59e69cd553b95.pdf
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/rajuwulamovajovil.pdf
    • http://zumewidife.mygamesonline.org/metal_gear_solid_3_boss_speech.pdf
    • http://bukobaxaz.getenjoyment.net/fisidugi.pdf
    • https://lozukiwilef.weebly.com/uploads/1/3/4/6/134644014/laxiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pululusodogi/billiards_pool_city.pdf
    • https://s3.amazonaws.com/fuwawibu/x4_defence_platform.pdf
    • https://s3.amazonaws.com/mejawiwomak/juneguw.pdf
    • https://s3.amazonaws.com/muxegeza/element_tv_elefw328_reviews.pdf
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_330338b1a09b4cc79b7d2236e784bcaa.pdf?index=true
    • http://xakazasaravi.onlinewebshop.net/70612205290.pdf
    • https://s3.amazonaws.com/tokit/sql_database_management_system.pdf
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_2024d9b545744f9d8ce47bfc5e3e1fda.pdf?index=true
    • https://s3.amazonaws.com/gurowozenupifi/buccaneer_crossword_puzzle_answer.pdf
    • https://s3.amazonaws.com/sitozi/77451489226.pdf
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_c5032ff0ea954d0792599c6182fa53c8.pdf?index=true
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_e07d86dc037b4f559c7cc9c89fed560e.pdf?index=true
    • https://s3.amazonaws.com/bupaxomu/chrome_extensions_android_ublock.pdf
    • https://s3.amazonaws.com/lekizopiloref/21771105360.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_off00010752.bin
7cdebde968c8525147dfafc22c93448afab0d361cc7b036399f30b338482f43c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 5400 bytes
font_01_sfnt_off000119ba.bin
979132efcf3e553504c34505d0b34323284473e0f0da35522d3d0c566f0ffc4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 10460 bytes

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