Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54e66cb3d1c026a…

MALICIOUS

PDF

80.0 KB Created: 2021-05-13 13:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: afbfd6b83592aa8a26641a823a09d5f3 SHA-1: 569eca34d58f37f4c7f8a0930f9948e4e9768917 SHA-256: f54e66cb3d1c026ac90754f8502f7d159cfead1df3e33d757722c62e961c6bdd
66 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier strongly flagged the PDF as malicious. While no scripts were directly extracted, the presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://golowaki.ru/strik?utm_term=tabla+de+densidades+liquido+solido+y+gaseoso PDF link annotation
    • https://cdn.sqhk.co/legikowe/QjaCjcZ/bezier_games_one_night_ultimate_werewolf_daybreak.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/Ngghbjd/mujadozududagegeratefag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_600aaef56cbe6.pdfIn PDF document text
    • https://cdn.sqhk.co/lifudidu/9jcibhg/95859498765.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393898/normal_5fcb2b3364fee.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenodisoda/X6Xjgr7/brookville_lake_map.pdfIn PDF document text
    • http://bizuzagewad.iblogger.org/96293625156.pdfIn PDF document text
    • https://cdn.sqhk.co/guzunilepin/PjehgoS/56494506491.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kifavudufolafu.epizy.com/jose_emilio_pacheco_el_principio_del_placer_gratis.pdfIn PDF document text
    • http://jevesukobiji.epizy.com/luvevulemunuzitipikobe.pdfIn PDF document text
    • https://c335e157-9962-4e43-983a-f5fcf491c4e2.filesusr.com/ugd/a09b09_2b59f99ae6b44c569cd85079b6cdae14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/709a6ee3-fe82-471b-be6c-7521efdbbbfb/when_was_the_lexus_rx_350_last_redesigned.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_d235bc73906e4eb4a77c82ecd28c2b78.pdf?index=trueIn PDF document text
    • http://desebavufix.rf.gd/sovovadesu.pdfIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_f5329b8c2ec041ca87030f48c1fad6f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/619ffbdc-ddd4-492c-ad5d-eee89650f119/craftsman_2.5_gallon_wet_dry_vac_filter_bags_2_pack.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_8eb91fca337341f8935b713c55c156c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/993bfa59-c145-42eb-b37e-0e145f6986ff/7919326038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a75d8c2a-956a-4a78-be55-1321790a9c2e/87416655536.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_e7baa4933d244bbc9344d6e1ab74b001.pdf?index=trueIn 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_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 5216 bytes
SHA-256: b432070cd2a9b230b4e93895c9f6ab0c23267483fbe5c5b0ba3dc88038c5cb9c
font_01_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 11780 bytes
SHA-256: 48b89b37daeaf101fe85167176662de874c3bc1b018967f7209707a23036b9ae

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