Malicious PDF — malware analysis report

Static analysis result for SHA-256 68479c2745014ba9…

MALICIOUS

PDF

130.0 KB Created: 2021-03-07 14:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52a1c6671cd5bc814b7f6becf5d7d41e SHA-1: 2f1feb7154f61794aceb2b3abc3c04632797ff50 SHA-256: 68479c2745014ba9ae345e39a85e0079119fb8902338d5003a8a59bab4907643
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 benign, but one key URL points to a suspicious domain. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content.

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-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://pelibifir.ru/strik?utm_term=tc+helicon+voicelive+2+manual+pdf
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/4f00b0dca44c17b.pdf
    • https://jitedamanun.weebly.com/uploads/1/3/4/6/134627504/3769985.pdf
    • https://cdn.sqhk.co/vomisape/Ujjhgif/2146049056.pdf
    • https://cdn.sqhk.co/nopawuwam/T6nyJv3/that_s_life_mac_miller_original.pdf
    • https://gunobome.weebly.com/uploads/1/3/1/3/131398345/nukotaxej_bajixufovogu_ximijajovifefo.pdf
    • https://cdn.sqhk.co/samekikogeri/hjfhd3L/gatal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7456362a-b164-4947-b0a5-07e7f96a793a/juxibidajilusuwuvimavoni.pdf
    • https://c18d9829-3add-4afa-bc87-35007fe3998a.filesusr.com/ugd/70c1ec_3b15f844247e44339e7365d3ab619649.pdf?index=true
    • https://s3.amazonaws.com/baxadelefofibuz/calculus_maximus_3._8_answers.pdf
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_eb211f71df8a45f1b9944f834bd40c57.pdf?index=true
    • https://21d44941-995c-48b9-956b-8145330e20d5.filesusr.com/ugd/577b75_d76a49b384ef4c08923aaadfaa57ccb4.pdf?index=true
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_8b91644168bf4febadcb94de10279bcb.pdf?index=true
    • https://s3.amazonaws.com/temujonuwu/jiditowom.pdf
    • https://s3.amazonaws.com/xefejevife/40478257602.pdf
    • https://uploads.strikinglycdn.com/files/03f722d3-38bc-49da-b090-37069cfa4c9e/nabigifek.pdf
    • https://uploads.strikinglycdn.com/files/f9cb3281-c677-43d8-b196-6825eb6f6b17/warm_up_exercises_for_seniors_video.pdf
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_21c7ab1dbfd74cdfa227df269f9ca42a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e02e853c-2411-442b-ba5d-b36aafe4f278/how_to_use_rabbit_ears_on_a_smart_tv.pdf
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_44474a5a69ca4dedb0f2a8f984ab4d47.pdf?index=true
    • 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_off0001c20c.bin
93fa086379dc83a38b5e5dd13497e9f4acf19fa6c109b8221c750db4e4b4e4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C20C 5264 bytes
font_01_sfnt_off0001d3df.bin
38e0de18e6846bdc0f6f57ad29ed9df1b6fc7d83a29037200c1073a327e9de06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3DF 11388 bytes

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