Malicious PDF — malware analysis report

Static analysis result for SHA-256 350f1027189ddc17…

MALICIOUS

PDF

72.4 KB Created: 2021-02-16 06:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ab9e8fa5c32d51c0d77be35862cf5578 SHA-1: ad93e35239ebc6e41e52a7b573b85236d90857a1 SHA-256: 350f1027189ddc17a11d1fee19a65e14235ae52ac9fd690e8e7f709b10db9d6e
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, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=cloud+9+vape+hattiesburg+ms PDF link annotation
    • http://intereriia.com/family_life_merit_badge_worksheet_2018ci8oq.pdfIn PDF document text
    • https://mufisifarugevap.weebly.com/uploads/1/3/4/5/134595961/2e129.pdfIn PDF document text
    • http://edalovert.xyz/jedivexibugajiviti9dg2k.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/eYhbjiR/97586312893.pdfIn PDF document text
    • http://show-visitor.xyz/70224051637wvz8l.pdfIn PDF document text
    • https://wagemerefav.weebly.com/uploads/1/3/2/7/132712282/zomowitexezelagi.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/0094ce89a3fee3f.pdfIn PDF document text
    • https://duzufeto.weebly.com/uploads/1/3/4/7/134734580/2481615.pdfIn PDF document text
    • https://jigotofobab.weebly.com/uploads/1/3/5/3/135300724/94bfe5acf50.pdfIn PDF document text
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/5069045.pdfIn PDF document text
    • http://stepka2016.xyz/sisters_tv_show_itv_2020golw1.pdfIn PDF document text
    • http://svarka-aurora.online/examen_del_primer_bloque_segundo_grado_primariaz2v99.pdfIn PDF document text
    • https://dixatuwep.weebly.com/uploads/1/3/5/3/135398053/8140257.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megulu/video_portfolio_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/sebinamav.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/vagolotabidezizukutamoxaw.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_off0000dbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE1 5632 bytes
SHA-256: 5532b931e7ae02418183e111c54f6aa0aff778a40b5bdbe578eef745c1f70a43
font_01_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 11064 bytes
SHA-256: fc8290843115d9b973844ae81b014696211f23509966a122b52bb86731ac5b90

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