Malicious PDF — malware analysis report

Static analysis result for SHA-256 347c253c3e4695dc…

MALICIOUS

PDF

72.2 KB Created: 2021-03-15 11:34:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd3802ecf2f5cfd1f9f740418598ab1a SHA-1: bcadad6eb1dfa486a8ffb867956aaf1c5e7f5701 SHA-256: 347c253c3e4695dc67a0cbc5104f3f40d6162db5fba840259e98745766b8aa6e
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 pointing to S3 buckets, suggesting a link farm or SEO poisoning tactic. The primary external URI, 'https://gimoguvi.ru/award?keyword=adiemus+karl+jenkins+sheet+music+pdf', is likely a lure to disguise the malicious intent. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing or trojan payload.

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://gimoguvi.ru/award?keyword=adiemus+karl+jenkins+sheet+music+pdf
    • http://bestrongbyg.com/what_was_american_society_like_in_19611oam4.pdf
    • http://circus.market/43283641191v6rqm.pdf
    • http://narovomesizi.medianewsonline.com/adding_and_subtracting_mixed_fractions_with_unlike_denominators_worksheets.pdf
    • http://plusstore.pro/eater_guide_hong_kongydzpt.pdf
    • http://sodalabs.club/how_to_gain_muscle_in_crossfit66ulp.pdf
    • http://1pokypki.website/nusilugilejoj35pbn.pdf
    • http://duwudivusupo.mygamesonline.org/notability_markup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/regufojalojaza/socratic_seminar_questions.pdf
    • https://s3.amazonaws.com/faluzotixupi/vorokigerowe.pdf
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_2bda413e6fe94c7e847034d18f6239e0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/22d1a34b-bad7-4426-b154-f231513a907d/how_to_fix_printhead_hp_8620.pdf
    • https://s3.amazonaws.com/vasofirida/ubuntu_for_virtualbox.pdf
    • https://s3.amazonaws.com/kotidox/34697027679.pdf
    • https://s3.amazonaws.com/sewamos/43447159619.pdf
    • https://s3.amazonaws.com/votawawo/rexav.pdf
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_41cb3c9fbcc44fcd81542ca4dc10d215.pdf?index=true
    • https://s3.amazonaws.com/wemazun/rokaxes.pdf
    • https://uploads.strikinglycdn.com/files/310e2810-8cc1-47d7-958e-dd3e094b3dc6/zivuxitase.pdf
    • https://uploads.strikinglycdn.com/files/52bb0a20-6ba6-4001-a74c-f09ae7cdb596/zulemakajetibufuz.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_off0000da7e.bin
606e0afd1f3ede763726d28660ee87769b8a69a1158f2334871085d627e165eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 5524 bytes
font_01_sfnt_off0000ed25.bin
1e75cf7be1cd21ee018c6052b22ffa70f995c8ad85fc237a9a49623c970f35aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 12020 bytes

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