Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50ac653a96decbf…

MALICIOUS

PDF

78.8 KB Created: 2021-01-06 11:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b4227ce72d52afb3fb9cd29ea8ab6c55 SHA-1: 78cb21fba29a8932f05316db513b412362e9b6aa SHA-256: e50ac653a96decbf2699283e35744fcb0fd42187d3cc92215c8a4e27918ec743
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to requesting a credit report, aligning with phishing tactics. The presence of numerous external PDF links, many hosted on Weebly, indicates a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=sample+letter+requesting+copy+of+credit+report In PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/a302deb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424951/normal_5fcd788a47f06.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/polamikolewe_nafonel_faler_lozipo.pdfIn PDF document text
    • https://murarukaxew.weebly.com/uploads/1/3/4/6/134666391/58391b0.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/dovagopu_tabuvatemov_gekubexadik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5fa50cc93c3f8.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/iaOhf4q/fuxep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_5fbb0bdf60c42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/clinical_practice_guidelines_in_diabetes.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/brett_torino_wife.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/69599658963.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/42020690877.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/one_point_perspective_definition_in_art.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/60438478729.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF767 5808 bytes
SHA-256: b2ae8f578138ec478f05fc7c8958ae56ae2df756142256db04cba99c6850276f
font_01_sfnt_off00010b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 10292 bytes
SHA-256: 9d1a3dc9fe0b6cda5aa6d4fba31d41a0d7f22eaa4f83f5f3367e636c0745b384

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