Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f00116dea204839…

MALICIOUS

PDF

75.9 KB Created: 2021-03-27 10:37:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c08bb8010516779ade7a64e73889c323 SHA-1: 193b8d088d6dd70de7aaacfbb452de791828db79 SHA-256: 3f00116dea204839f305cef19573e2794909fb7a751b4c2e64055f5afd9eba83
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of an SEO link farm, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'https://zajinet.ru/award?keyword=b1+cefr+sample+test+pdf', which is highly suspicious. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm the malicious nature of the file. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/award?keyword=b1+cefr+sample+test+pdf PDF link annotation
    • https://cdn.sqhk.co/jarixizotib/bLha0ii/sawuzavuxe.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/nalabute.pdfIn PDF document text
    • https://jafovoguna.weebly.com/uploads/1/3/4/0/134096268/walodiwegadolib.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/hichgzC/mugerisofovosupeponopol.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/jguzgjk/5470802554.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/50fcfa94-2813-4c29-8ee5-c7bfa37f19e8/what_could_cause_a_dishwasher_not_to_drain.pdfIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_8fc4c2681b1b44ddbcefd86299d799bd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/13252277347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da585ff3-ba19-45f8-adff-53c872b752cc/tikurejumasigiki.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_01344df4af804f599ac9bdd03ab519b5.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_bcdc94339ef148cf87496f96f38e3671.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legipalofi/flyff_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/guvivavepafetagerizupen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/682bf871-c5f5-46e8-88a8-bd90a8070ca5/john_deere_425_60_mower_deck_parts.pdfIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_91c9503364a942658070f04e67a5f23f.pdf?index=trueIn PDF document text
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_d48632dbebe5445ba4c6d222d9189784.pdf?index=trueIn PDF document text
    • https://cfff6b0e-fc0f-4d9c-a983-c0e60c8b2bfd.filesusr.com/ugd/c637e3_737932ceedf5430681f23ef3c181d2f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/marla_maples_trump_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51fbc7fc-97f0-4719-977f-e818d7c88cc8/94963244518.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_fa7d7d907ac748e88aee9e5c468103cb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/garorowa/el_pollo_loco_5_dollar_combos_menu.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_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 5404 bytes
SHA-256: 89039ac4a7c46500d10dfd6abbc3dc649a6c32e59703fc27f5ea1dc276f7b286
font_01_sfnt_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 10644 bytes
SHA-256: e40df62b9b582938009f8fb91dbb5b0959b7546e24e075720d2c3a6279d69a58

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