Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ee0689d6cebe90…

MALICIOUS

PDF

72.8 KB Created: 2021-04-30 19:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6a536a8d39b4e1eb38f2ca357ef11447 SHA-1: 0f3a9dc9aadc257f4d17309260bfe7a177a11c65 SHA-256: 92ee0689d6cebe90d154c0455e96f7c98bf15a36c66875cc6af512bc518e97a2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to its creation by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect users to malicious sites.

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://leonvi.ru/strik?utm_term=black+and+decker+firestorm+14.4v+cordless+circular+saw PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422373/normal_6029a6abee8c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60216bf756f67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_606585c37d9a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_603ea8248552a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_604785108a6bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_6033f9994be13.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/97b891d8-a8cf-46aa-8b15-00e21ad11abe/duvuzebajabigaz.pdfIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_403beb9bd1524984911fae7050646672.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wekibik/prevost_coach_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/814b1de4-aeea-43b5-8e5b-f56a7da59005/67783938993.pdfIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_411c85c7850946afa862817e0c3db5e9.pdf?index=trueIn PDF document text
    • https://8a83ad47-1dc6-4e38-b726-138de0fe4a7e.filesusr.com/ugd/043c68_1d9663f41f4e4cb1a913b711ea242f80.pdf?index=trueIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_3fd7343a568c4128be8cf4901ca9a331.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_ba7eea27f3f049ebb2cbc7a92f8789fb.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_da3ee41cac56499aad91bde9a3cea1f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df133a5-59f8-4b5b-ba18-87456fe7ddd7/what_happens_at_the_end_of_a_mountain_between_us.pdfIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_cdc03707c9974756a9993ff4fdae39c3.pdf?index=trueIn PDF document text
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_290be1ef55f248d2ac102a6f9287cfdd.pdf?index=trueIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_ab0c296fc1b841f188cd293b9dc3e80e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/14976175975.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_off0000de95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE95 5604 bytes
SHA-256: 6b5f5d707cf1d6c6712c867a3410de269de53a9aeadada5d39525f2988fcb3e0
font_01_sfnt_off0000f1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B2 10596 bytes
SHA-256: bbbc97d6dda8f6d8b7e9b1f75f5315d8059eb49f53c955178e146ccbd648ecfe