Malicious PDF — malware analysis report

Static analysis result for SHA-256 6041a6f63d528c67…

MALICIOUS

PDF

73.6 KB Created: 2020-12-19 22:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54782819e7f611b1ce4cbba520ce4f75 SHA-1: db6f986ac1e76afd67194e18ef4ed87d0f06eb78 SHA-256: 6041a6f63d528c6750cc1287a35344307244e02ca446cba32605c411afa069e7
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that masquerades as a service acknowledgment form, which is a common social engineering tactic to trick users into clicking malicious links. No scripts were extracted, but the presence of the malicious URL and the high confidence detection scores indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://trafficel.ru/aws?utm_term=acknowledgment+of+service+part+8+claim+form
    • https://cdn-cms.f-static.net/uploads/4470218/normal_5fb83dd417cfb.pdf
    • https://cdn-cms.f-static.net/uploads/4403540/normal_5f918677eaf11.pdf
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5fb5a2de5d072.pdf
    • https://static.s123-cdn-static.com/uploads/4480756/normal_5fcedb55941fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/lososimap/zelolebukefil.pdf
    • https://s3.amazonaws.com/rebomedug/15843402806.pdf
    • https://uploads.strikinglycdn.com/files/915132d6-5660-4787-ac75-661c47e7fbda/42363100419.pdf
    • https://s3.amazonaws.com/pidufozu/barbershop_3_free_movie.pdf
    • https://s3.amazonaws.com/xuvamuba/xozexotugovebevilisal.pdf
    • https://uploads.strikinglycdn.com/files/469a3f57-0126-48a5-8e4d-b6e94ee42bc2/xojugiros.pdf
    • https://s3.amazonaws.com/wotodedaruzuk/how_to_make_rainbow_text_in_photoshop.pdf
    • https://uploads.strikinglycdn.com/files/11b1d43c-5cd1-4836-b920-65fa81c6e97d/jukogorisevib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5c6.bin
e5acc67895704efe7589ab09e2924ca6226efd9e9c76459f75f59d1673b07430		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C6 5664 bytes
font_01_sfnt_off0000e906.bin
94dc72fd06b649f0016e7d5d3feb83860d63bc8e4e937c09a65abaaf85f71aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 10016 bytes
font_02_sfnt_off00010b10.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 4324 bytes

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