Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f707668732ca656…

MALICIOUS

PDF

77.7 KB Created: 2021-04-02 12:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9661f3b8d4712107ef17fffa044e3b33 SHA-1: 13c9bb150a7c52abff097acdb87e134cecae2f7e SHA-256: 5f707668732ca656b0347ac5cf4a346a93c22543c8d3e498223e3ae8625131a3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=honda+generator+5000w PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465556/normal_5fea15c2a8c47.pdfIn PDF document text
    • https://cdn.sqhk.co/ronizimat/igggjbq/police_bus_driving_game_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/ghgeLhg/internet_fashionista_dress_up_game_games4m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5fe633a51f924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_60411c7c49073.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/47ae9f7c-8488-4fa8-b3cb-e083b195dc8f/nordictrack_exp_1000i_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5021d662-4464-42f6-8838-08276389d3bd/graco_my_ride_65_recall_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d7f2d78-129a-40b9-8c8f-54e2116533cb/big_mouth_and_ugly_girl_summary_chapter_26.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7340bc6-3401-476d-8d3d-230495f552b4/24975682866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d8dc8fd-88e0-4b65-97f2-fa042c73b336/36989828833.pdfIn PDF document text
    • https://e2a3f85e-3ce8-4c76-99a2-e63219cad5ad.filesusr.com/ugd/473d25_8ff5dfb1a3364994b6bae43bbdc16a7e.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_8d9b2e6c0ba64aad8c9892107cae3172.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a77885-4c97-4a84-892e-3b26b1d05761/mokukijur.pdfIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_da5786822bb44d42afb933096171e8a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9620bc1a-2e02-4056-9304-fe523caafde1/how_to_reset_a_whirlpool_washer_duet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acb8c12-fc5c-4e8d-ab6a-aff1858005b6/tadamobimar.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_de93ab88957e47bf8f1744e320691c07.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_2e8bfc9b63bc4159a8c8c293e384bbc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c44471c-4bdb-41f5-be3d-894573b5a38b/9017687386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea6aed3-79e5-47ee-aef4-afaeca9c65c5/brother_pt-65_not_printing.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_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 5100 bytes
SHA-256: 71f1f50bc282a907b243b9218ce9ac4b23113203051df1807820bda6555b42ab
font_01_sfnt_off0001036d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 11312 bytes
SHA-256: d7a1377c4396748963b2010d0367048321de8da0cafa98f140bacfcd74581d3e