Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f0c6816240cd99…

MALICIOUS

PDF

73.9 KB Created: 2021-04-08 01:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13b9c39933dda472636f0526e2ac2191 SHA-1: e58c6c7af6cdbb140471ab2074b0e0f8d497ddd4 SHA-256: d1f0c6816240cd99b3a5eadc4399514a1738f851ca1b1e969b2e4926262b1ae9
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, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing or trojan variant. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/123?utm_term=bajrangi+bhaijaan+zindagi+songs++pagalworld
    • https://lenatazuponos.weebly.com/uploads/1/3/4/8/134888684/051a154c.pdf
    • https://bebiluredop.weebly.com/uploads/1/3/3/9/133987060/42e237c.pdf
    • https://dunawotota.weebly.com/uploads/1/3/1/4/131438316/0954043df87aab.pdf
    • https://mobajexiv.weebly.com/uploads/1/3/4/4/134455683/76d88.pdf
    • http://garanibukumom.scienceontheweb.net/current_safety_topics_2020.pdf
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/togafiga.pdf
    • http://leomannapov.com/75545278950md7jz.pdf
    • http://wwbook.org/53280781092itt5b.pdf
    • http://fortuneo.biz/tixatorifoxuodcfm.pdf
    • http://tk-pobeda.site/what_is_the_cost_of_large_letter_stampq6gzx.pdf
    • https://bojomuse.weebly.com/uploads/1/3/4/4/134462584/8201899.pdf
    • https://rewazifepa.weebly.com/uploads/1/3/4/6/134664269/buxudog-ranevilog.pdf
    • https://mazoguwikite.weebly.com/uploads/1/3/4/6/134614920/roxopis_zorad_lusomenevemu.pdf
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/kexomi.pdf
    • https://wapawovukeped.weebly.com/uploads/1/3/5/3/135333371/tukexededoxar_mijowuda_rorizeko_xewapevib.pdf
    • http://maslovauto.ru/12571457204yfn8k.pdf
    • http://rilomenininun.getenjoyment.net/tatumunakadefidixevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/222a9d16-d97f-48cc-bed2-f13a35962bab/d_link_dap_1522_manual_download.pdf
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_d082fbe25e4445d7a01a6f52cc52d593.pdf?index=true
    • https://uploads.strikinglycdn.com/files/90af55ee-c4d4-44ba-8dc4-7c07f6278e5b/gender_trouble_judith_butler_goodreads.pdf
    • http://xizokenimufewom.atwebpages.com/36262096470.pdf
    • https://uploads.strikinglycdn.com/files/ffc3b8a3-9e7e-4e12-a99a-87d901aac20d/how_long_does_it_takes_to_fall_in_love_with_someone.pdf
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_83ed1b51147c40fd9d2d66d564ab2713.pdf?index=true
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_6bba995e381e4486adc13730ed90a9d4.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e148.bin
a4494020145394eb2d7ec91cefbe542bb534d51eb9acd0e96059fbe3c0f2baac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 5628 bytes
font_01_sfnt_off0000f47f.bin
1af3fe7d3b0e3dd301e87bb0782eb7cbef91a2d1bdb561b1126cd9746724769b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 10904 bytes

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