Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8521da1eae50e6…

MALICIOUS

PDF

73.6 KB Created: 2021-04-04 11:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddf77041e5d1c332c1116356cb3ddf6f SHA-1: 1b1bc026dd84dd22715b05bcad165b56710e0ad9 SHA-256: 2c8521da1eae50e6f541fa19dcb84bb2188d6df54d2a2856c6bbed6743c04300
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm. The primary URL, https://vilenefex.ru/wix?keyword=diapositivas+en+ingles, suggests a keyword-based redirection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO spam. No scripts were extracted, but the structure and URLs point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=diapositivas+en+ingles
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/vulisasekamesefoj.pdf
    • https://lusizemanu.weebly.com/uploads/1/3/4/1/134108609/jolojegigefar-rumofuk-mafuxolaw.pdf
    • https://gimeboxevamovuv.weebly.com/uploads/1/3/4/4/134494840/7223488.pdf
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/3501274.pdf
    • https://monogelifanalo.weebly.com/uploads/1/3/5/3/135387447/pelujegebafoz.pdf
    • https://tufezojaf.weebly.com/uploads/1/3/1/3/131384552/ab934e335.pdf
    • https://dirasikazeta.weebly.com/uploads/1/3/1/3/131379856/baralogosojiruf_vegiz.pdf
    • https://janodiwuzujemux.weebly.com/uploads/1/3/1/3/131382133/falur_simezuruwad_wefajawo_zitotigimo.pdf
    • https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/penabagikaworaxubaz.pdf
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/kalipopajo_lipobogotomu.pdf
    • https://ketafimevudo.weebly.com/uploads/1/3/1/6/131637081/18c3d9.pdf
    • https://biwoponafi.weebly.com/uploads/1/3/4/7/134767969/zovevesaxewibasip.pdf
    • https://sebidodeg.weebly.com/uploads/1/3/4/4/134438526/bamaku-jepumub.pdf
    • https://pimiwunuxijekez.weebly.com/uploads/1/3/2/7/132741089/vizijexasujuwip_navibaziji.pdf
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/a1e935.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_118795d01df644a4b938ee7fef0b32e3.pdf?index=true
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_786db83f6f5248b9b5e02ec9dec29bf0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c3035a57-e5b4-4a61-bb12-6533fbc14490/56893478003.pdf
    • http://kazaxeso.rf.gd/zobupexavazixowazivemaw.pdf
    • https://uploads.strikinglycdn.com/files/238743d5-0189-4186-9cd8-c41c1bd2dcd7/5104084913.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_013a81b1d70c4d18b0e084a74ab9c55f.pdf?index=true
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_f4c0a33e6cd849179ddacdabc5cdc6f8.pdf?index=true
    • http://megavidovafivo.epizy.com/262233912.pdf
    • https://uploads.strikinglycdn.com/files/254635ef-2bab-42d6-9174-ceaca211418e/mississippi_state_university_campus_map.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_off0000e460.bin
ea19641721aa115e77ef3baf2172e3e702026f0adf520e9213aada718c1c2136		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 4952 bytes
font_01_sfnt_off0000f55e.bin
361cb6b5eb0b2715d9a4f0cba1a67d7e8de4a34ddb4622c46d01ffe323c77595		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 10900 bytes

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