Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a402b1a95c537e…

MALICIOUS

PDF

78.6 KB Created: 2021-06-11 01:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05e681f29bb3634f887608516cc5f754 SHA-1: ee28868479ed842245ae6f108af900ca69293566 SHA-256: d3a402b1a95c537e4a1c2d2b30a9909dbd2ed0e84a72426bbabddee1784ff5a8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious content. The primary URL, 'https://ketchas.ru/pbw?utm_term=1+acre+equal+to+kitna+bigha', appears to be a lure, potentially related to search engine optimization tactics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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
  • 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://ketchas.ru/pbw?utm_term=1+acre+equal+to+kitna+bigha
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/wotid.pdf
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/1473069.pdf
    • https://neburaguvud.weebly.com/uploads/1/3/4/4/134477844/fifuvunozam.pdf
    • https://finuredapek.weebly.com/uploads/1/3/4/3/134352460/fojet.pdf
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/maxof_pakakur_fanuduxusezob.pdf
    • https://jevikefogonilij.weebly.com/uploads/1/3/4/7/134747067/5756263.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/sovegenovefivateku.pdf
    • https://gupuletafajural.weebly.com/uploads/1/3/0/7/130776102/4498123.pdf
    • https://salizobujexi.weebly.com/uploads/1/3/5/3/135325558/2f6cfd.pdf
    • https://senugosuka.weebly.com/uploads/1/3/1/4/131454109/6029631.pdf
    • https://jatuserunel.weebly.com/uploads/1/3/4/6/134682763/d715ec8.pdf
    • https://saronikevuvu.weebly.com/uploads/1/3/4/4/134460573/e2fff433fdd.pdf
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/9508639.pdf
    • https://duditoza.weebly.com/uploads/1/3/2/3/132302736/02ec2a2006.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://degenazi.pbworks.com/w/file/fetch/144478953/joxifatalidifalubinuxone.pdf
    • https://uploads.strikinglycdn.com/files/8a321c1e-c3e4-4841-bbb1-64376a79a29f/62917010206.pdf
    • http://likanegi.pbworks.com/f/30111657839.pdf
    • https://uploads.strikinglycdn.com/files/2a5530a9-44ef-4600-b367-bf253cd8882e/pumubo.pdf
    • https://uploads.strikinglycdn.com/files/b58f96f2-2fb9-4cf3-8991-8f304eba29d7/what_age_can_babies_play_with_playdough.pdf
    • http://vezawegafu.pbworks.com/f/jisotololanuk.pdf
    • http://veniwusuj.pbworks.com/w/file/fetch/145018335/clash_of_clans_apk_mod_unlimited.pdf
    • https://uploads.strikinglycdn.com/files/70c2a8d2-a717-4419-a798-7eb23c5e4052/33018968013.pdf
    • http://pukagij.pbworks.com/w/file/fetch/144468111/do_i_need_a_mileage_log_for_tax_purposes.pdf
    • http://bopelijexuf.pbworks.com/f/7044399318.pdf
    • http://buvavipoluvu.pbworks.com/f/31594822806.pdf
    • https://uploads.strikinglycdn.com/files/d0533841-3493-437f-8071-8f8743c3250d/49923306920.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e185.bin
492451209816dc40ea477e9be9c1b14b911f4b3346f2cad394e4b4eda7ac383b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5168 bytes
font_01_sfnt_off0000f317.bin
3248918fc90aa46147543ab1cbe6d1ce979f32f472f4f2a6f4eb87a5915464bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 10752 bytes
font_02_sfnt_off000117f8.bin
912e8c3c37b183d760f7f382ef110bdca05c7793b62d2efdd5772423ec248018
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 16068 bytes