Malicious PDF — malware analysis report

Static analysis result for SHA-256 34804ba809acef1e…

MALICIOUS

PDF

66.1 KB Created: 2020-12-24 06:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17ff4ef00bfc10b6a642401777ffe3ac SHA-1: 1d50d593b7391ccb173fc6d8fb6148d55023c6d2 SHA-256: 34804ba809acef1ebc577655c3af4d16f36c6df2db11a17d8d6a19660f5a01e5
136 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it uses an advance-fee scam lure, presenting itself as a "Blue Cross ma claim form". The embedded URL `https://traffking.ru/aws?utm_term=blue+cross+ma+claim+form` is likely part of this phishing attempt. No scripts were extracted, but the PDF structure itself is being leveraged for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://traffking.ru/aws?utm_term=blue+cross+ma+claim+form
    • https://cdn-cms.f-static.net/uploads/4387808/normal_5fa40c08c3b32.pdf
    • https://static.s123-cdn-static.com/uploads/4376369/normal_5fce48db9a9e6.pdf
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8a3d63c10ed.pdf
    • https://vutibije.weebly.com/uploads/1/3/4/6/134672754/gikefetunivag.pdf
    • https://cdn.sqhk.co/kefexunas/ibjdmig/31911174039.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rudelazifizuvo/giant_spider_osrs_guide.pdf
    • https://uploads.strikinglycdn.com/files/60dbc488-aa51-4e42-9ba0-b13255d1ab4e/zubuvejesajabapipikagav.pdf
    • https://s3.amazonaws.com/nijudow/konica_bizhub_c224e_driver.pdf
    • https://s3.amazonaws.com/pizivurapab/manual_instrucciones_audi_a6_2017.pdf
    • https://s3.amazonaws.com/tojazudibumogab/ps_51_nyc.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_off0000b99c.bin
a87780fbad4479ded94afc2f241402bc17c8679438d09f63de56648c3571b5bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB99C 4772 bytes
font_01_sfnt_off0000c9c6.bin
586c1353a38b1416ae6b7f33996a98e46ec5948d3a3329b9efee911b67911c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C6 10536 bytes
font_02_sfnt_off0000edd9.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 4324 bytes

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