Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2630b03e553c7e9…

MALICIOUS

PDF

83.9 KB Created: 2021-05-28 12:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 727a2ef7f0546ed741763d735b720aff SHA-1: d5a1c981a3ff828b99e8b0ce807d695c8c667b55 SHA-256: a2630b03e553c7e95899e684afe89bf008369f6626d586ffb6abcf3bde7b0fe4
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 pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=intro+to+trig+functions+worksheet PDF link annotation
    • https://japewilipo.weebly.com/uploads/1/3/4/4/134471591/4614539.pdfIn PDF document text
    • https://xuwowazasoko.weebly.com/uploads/1/3/4/0/134041707/5392611.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/medenefujexafus.pdfIn PDF document text
    • https://wuguxobexo.weebly.com/uploads/1/3/0/7/130739488/8274947.pdfIn PDF document text
    • https://janilunulosuga.weebly.com/uploads/1/3/0/7/130739392/b07b65cd34693f.pdfIn PDF document text
    • https://pelifofenap.weebly.com/uploads/1/3/3/9/133997555/mebulozowosozep_sisasivoveg_rowezogi.pdfIn PDF document text
    • https://xawoveramexu.weebly.com/uploads/1/3/4/0/134095940/2257059.pdfIn PDF document text
    • https://ziwarojuwetupo.weebly.com/uploads/1/3/4/3/134343479/7de2d16a94ec.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/zovuzidadafo_regir.pdfIn PDF document text
    • https://risidetumul.weebly.com/uploads/1/3/4/3/134320066/1284172.pdfIn PDF document text
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/kudisokukimeno_fufamasipawetam_zelareropudeleb.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/146c6bac7120.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/4198412.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/befivewowenadod.pdfIn PDF document text
    • https://ladulokepalixu.weebly.com/uploads/1/3/4/8/134878898/6fe2485.pdfIn PDF document text
    • https://kegazesawatodo.weebly.com/uploads/1/3/4/3/134378031/db23224eb.pdfIn PDF document text
    • https://wezobugedelu.weebly.com/uploads/1/3/1/8/131856743/3380227.pdfIn PDF document text
    • https://nepokotivo.weebly.com/uploads/1/3/2/8/132814168/8036459.pdfIn PDF document text
    • https://xozanazefozi.weebly.com/uploads/1/3/0/8/130874019/23819c501.pdfIn PDF document text
    • https://lomagifotoji.weebly.com/uploads/1/3/0/8/130814873/1063440.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/e8cb55c1-9082-4d85-ac4f-b2a43a4d59b4/75939877979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/995c70c5-6ff7-45af-89df-6c561b7ba983/how_to_get_ikea_catalogue_delivered_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aecd3161-57cb-4bac-8542-32084fd30d67/what_is_the_difference_between_descriptive_statistics_and_inferential.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62d4a2ed-a11d-453d-9320-7b004b9a6927/who_are_all_the_norse_gods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cdafaba-2dde-4f4d-9a79-a92c3767cadc/argumentative_essay_example_college.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_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 4996 bytes
SHA-256: 5ffc56abe10be62278b52bb5cafa93e3f0673f3920a30e937d00e643179d1f7d
font_01_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 10576 bytes
SHA-256: 996ee98fa060257e7da5f19685cbed1c0ccaded9936df3ba996f911ac7bd7cac

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