Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd14a73b8711c1e…

MALICIOUS

PDF

76.5 KB Created: 2021-06-01 07:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d6a6ca09d59e1e716f926f358a21f1b SHA-1: 7391dbc64a82fc6cc815478522e70faef80b6115 SHA-256: 6cd14a73b8711c1ea909e08c83686cad9839348ea4b90bce145c476345d672cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, https://crewmak.ru/pbw?utm_term=viore+tv+user+manual, is presented in the document body and is likely the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/pbw?utm_term=viore+tv+user+manual
    • https://vogobozonek.weebly.com/uploads/1/3/4/6/134667402/6406229.pdf
    • https://cdn-cms.f-static.net/uploads/4457312/normal_605aa8a0a3623.pdf
    • https://fusidaxeda.weebly.com/uploads/1/3/1/4/131453850/ropatijudekexur_gukubejulon_pimizakajexe.pdf
    • https://kivobuduzuv.weebly.com/uploads/1/3/0/7/130739084/94e2142.pdf
    • https://cdn-cms.f-static.net/uploads/4485321/normal_601da88de2fa9.pdf
    • https://cdn-cms.f-static.net/uploads/4412181/normal_6048305aa933f.pdf
    • https://cdn-cms.f-static.net/uploads/4450047/normal_606e9a0862e51.pdf
    • https://safupoxex.weebly.com/uploads/1/3/2/6/132683070/039305bf3db2d.pdf
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/8976370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vatojorisa.pbworks.com/w/file/fetch/144444990/87294134097.pdf
    • https://uploads.strikinglycdn.com/files/79e2f467-d300-4cde-972b-c085c22aee79/dragon_age_origins_mods_installieren_steam.pdf
    • https://uploads.strikinglycdn.com/files/0ee6739e-3292-4709-8dcd-03b141bfb314/this_is_amazing_grace_phil_wickham_lyric_video.pdf
    • https://uploads.strikinglycdn.com/files/1722be29-8a34-4e23-a7c0-50a3730268a8/how_much_do_power_plant_engineers_make.pdf
    • https://uploads.strikinglycdn.com/files/f8d91440-d576-4359-9e7a-b0b092f22685/brother_mfc_7840w_toner_refill.pdf
    • https://uploads.strikinglycdn.com/files/5da0c48e-e7ee-4110-841f-1926939c289f/78886910343.pdf
    • http://kedetuwi.pbworks.com/w/file/fetch/144413583/crash_bandicoot_3_psp_iso_download.pdf
    • https://uploads.strikinglycdn.com/files/d92c6999-7aa2-4371-ace7-ba6cfffcdffe/bodas_de_sangre_lorca_texto_completo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef6b.bin
8d0713a25cff497e4ee2e5f8e6dc8cb35cde9c960a8c25bcb27b2dcadc0b079b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 4856 bytes
font_01_sfnt_off0000ffd9.bin
3417442cbb7747b3a0740cbe0a05d7c667181007ff473bcfae0883334ce26f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD9 10968 bytes

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