Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4a5b2e2c8e5a49…

MALICIOUS

PDF

89.3 KB Created: 2021-03-28 18:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0368985cb339a19c77a29d9c7b53d631 SHA-1: d9962f7bdcb948c9ef3336bb31a8bc3dc1d956fb SHA-256: 6c4a5b2e2c8e5a498ea57bc93adf1ba8f503163cadab85d5e46e51a6b0513ba3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm or SEO spam tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://xajibur.ru/wix?keyword=edit+apk+xml+files PDF link annotation
    • https://nipoxumafoji.weebly.com/uploads/1/3/4/7/134717148/xakuxog_nogavanewu_nojemizogeku_gofekuvasem.pdfIn PDF document text
    • http://gbo.guru/rufolenokobemugibomubazu997.pdfIn PDF document text
    • https://cdn.sqhk.co/merejipofeto/Xieii4n/8913891059.pdfIn PDF document text
    • http://abanca-electronica.com/allison_marine_transmission_service_manual6204a.pdfIn PDF document text
    • https://rawewarox.weebly.com/uploads/1/3/1/3/131379085/4648594.pdfIn PDF document text
    • http://dektesheff.xyz/fakovik5tyz2.pdfIn PDF document text
    • http://flylovel.com/we_bare_bears_match_3_repairs_apk_modddn07.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Cm9jfWu/13324013923.pdfIn PDF document text
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/5650519.pdfIn PDF document text
    • http://damvglaz6.xyz/76062342154h1rgi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_08c6fe9fc7d04ade82d7ad1d526f8c56.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/radeb.pdfIn PDF document text
    • https://8d928d4c-4e32-4dc6-8093-d383c90b3cca.filesusr.com/ugd/b5d49c_3bf3e761cf3e4750945286837be5d2c6.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_f961e7d4a64f464cb8c0129fdf4766b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/vejawisop.pdfIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_05faf4767e9c436ba8c4e84d1c506a0e.pdf?index=trueIn PDF document text
    • https://37dcb74a-b492-4e6c-94d7-6984b04a3d7f.filesusr.com/ugd/01eaca_ee3b90df8c2b40069c7f47224a0cfd42.pdf?index=trueIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_1319997b047a45d6b935d6c31e1beb02.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_d4716badd2434645bfca618e1269c685.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/cmos_4001_datasheet.pdfIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_baad137ef0574cdf93b487c4abdb052e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nademopor/fagujuzonarugod.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/gegurexegaw.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_b20611764f444fc3a4dbaabeb342dd35.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_1a24a20491b242e6815c533feebd7f4b.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 2952 bytes
SHA-256: 18f3dad90f0b8a749557125039a501166b605b51d41492c5c2dfd7e147c8bf53
font_01_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 5180 bytes
SHA-256: dbdae0e95800a3b9091515a0d34a5b06ea715443e9cf9b1879cc12aea4a821dc
font_02_sfnt_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_03_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 10956 bytes
SHA-256: c0fe0edbd6196f9847d069ab4d9f33457a4852ebd533f5e922a8527e66f8e3f8
font_04_sfnt_off0001400e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400E 16080 bytes
SHA-256: 8c057ff56373bbf45afdd23f1044ce12c5a9a8acf3353b47e648605ecd89557f

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