Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cbb4ae317ebdef…

MALICIOUS

PDF

79.3 KB Created: 2021-03-29 06:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b2c4aac31aa59267e1cf5921cae308be SHA-1: 167a26a6143f4773f31cc3d40991a93f28fd193f SHA-256: b2cbb4ae317ebdefa002fc8dcece28ba041effebe7c9ebccf67aaaa3898e501b
246 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains, a common tactic for SEO link farms used to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites, possibly exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://midufefew.ru/wix?keyword=garcia%2527s+barber+shop+hornell+ny PDF link annotation
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/lexakuzugos.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/how_to_answer_nclex_pn_style_questions.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/99648528599.pdfIn PDF document text
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/3358044bc9c4ed0.pdfIn PDF document text
    • https://tepaxomiro.weebly.com/uploads/1/3/6/0/136019937/6240712.pdfIn PDF document text
    • https://gunutusubev.weebly.com/uploads/1/3/1/4/131437775/wavitesotumesekufowu.pdfIn PDF document text
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/semef_vopenofisemo_dofujuku.pdfIn PDF document text
    • https://jinugavov.weebly.com/uploads/1/3/4/4/134438703/manewaxutav.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/92277681a8.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/kejoxixunozuwufovu.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/sudepa.pdfIn PDF document text
    • https://rediwugozuza.weebly.com/uploads/1/3/1/4/131438197/worudugise-xetukufuvanusop.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/nexigax.pdfIn PDF document text
    • http://zubudiru.sportsontheweb.net/chuyn_t_file_nh_sang_trc_tuyn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b043854-38ec-40b1-9043-919d1750dc6a/symbols_used_in_automotive_wiring_diagrams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9271e6dd-b53b-47ee-8720-4e5f47251589/54523699379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf96a1b-dd05-4f21-beff-a49de8cd0a5f/la_divina_comedia_el_infierno_de_dante_audiolibro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/655ea1a3-5cfb-4cc7-a30e-9bf59d2dde05/kajemafozasasa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5328 bytes
SHA-256: 015007b5b593cf3410d23b846730b8e18327b24d64f6ab0205c82096b084f83f
font_01_sfnt_off0000f3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A6 12176 bytes
SHA-256: 576ff3f213cb18e0665e2d302c8e1c35c353ab017f4a658dc2a8e1b5c9cd88c8
font_02_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d