Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7af14ed493c9667…

MALICIOUS

PDF

81.9 KB Created: 2021-05-24 14:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: eaf2019dc63d553ed2da1d2301282340 SHA-1: 04a102d3e65a1ec9fa7558be3f698cd2ad2b856c SHA-256: a7af14ed493c966712173a515e88db48fcd2dba6aa2721fa5b330b80c57030ff
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings point towards a tactic of creating a deceptive document to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://xezojetit.ru/strik?utm_term=kamyab+jawan+program+loan+bop+online+apply+form PDF link annotation
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/5040162.pdfIn PDF document text
    • https://miroguwitofenev.weebly.com/uploads/1/3/5/9/135958286/fujedevajigoxis_negeg_tisepigagefa_kekerisuwizomo.pdfIn PDF document text
    • https://larojebuwovu.weebly.com/uploads/1/3/1/3/131382373/1320721.pdfIn PDF document text
    • https://widobane.weebly.com/uploads/1/3/4/3/134340358/00da57e55024405.pdfIn PDF document text
    • https://jaxedafotonomut.weebly.com/uploads/1/3/4/8/134885779/badokokomugekot_toronoxijeba_kujev_rolud.pdfIn PDF document text
    • https://saduzoxizujakef.weebly.com/uploads/1/3/1/0/131071125/4590412.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/pabebuxazezavugefer.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/1c8b17f7-818f-4d30-9ae0-7fc12e9fe65e/wezuxolesipulolozutevovo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e14645-3e0d-4c74-8f79-008bf090a0d1/96366998000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd18d93c-6685-4b9d-8b26-0ae4c60ce0ac/75106411604.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/pewoseza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faeb976e-790a-44bb-8119-418130914652/tezogigevadozoxajatira.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef23bf9e-cae5-4838-a993-547dcb446730/92841666703.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/gigixiguxu.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/how_to_apply_for_letters_of_administration_wa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76946eda-67d3-4c23-8cee-3191638d6b99/77317080538.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c91b4691-7f16-4909-96eb-864f14bee300/bash_script_include_variable_in_string.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b61a726-a2e2-4521-9dad-89dee188999d/cell_structure_brainpop_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fe87f0-d45a-416e-be8f-82188fc481a6/woxofivegopal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43d3a166-42a9-449b-8d2a-573d990cd834/52892398190.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/american_standard_freedom_80_furnace_specs.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 5420 bytes
SHA-256: 4fc4125f67c8e8c9bc1794c71fd902bed3cfb65bea672ff40a496122d11499f8
font_01_sfnt_off00011224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11224 11604 bytes
SHA-256: c291bfa55061d45b52f1bc49b7bba0fcaae9cfe7e4f591d2afe33730344c57d7