Malicious PDF — malware analysis report

Static analysis result for SHA-256 544e47cf67492b24…

MALICIOUS

PDF

70.2 KB Created: 2020-12-15 17:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c88f691a6730bf53c530eaf8a9fba916 SHA-1: 7f6fe4b06fcebfdcbe41a947391842f4d728a123 SHA-256: 544e47cf67492b2421f37ac8a8bfc0f6885154eaab3968fbe97b5b0e219874aa
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/wb?keyword=ap%20sachivalayam%20syllabus%202019%20in%20telugu%20pdf'. This URL is likely used to redirect the user to a phishing or malware distribution site. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffmen.ru/wb?keyword=ap%20sachivalayam%20syllabus%202019%20in%20telugu%20pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5fc4775321c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370762/normal_5fbb232209935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412391/normal_5f935c4c94c9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5fd7ddac07b8b.pdfIn PDF document text
    • https://murikupa.weebly.com/uploads/1/3/4/4/134481598/fedilufevagak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/52591545715.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/sims_4_doctor_career_sickness_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fced908b1d401545ae4d64d/t/5fd17fd55e090321caaac646/1607565270988/dr_chesser_rock_island_il.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57099a3bf4b14abc7ab13/t/5fcf4ae714319a51dc2e5fde/1607420647966/pukasanuwogin.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/95347954962.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CD 6016 bytes
SHA-256: 0d3c2c31a083fe3931b6a1f814ccc6d8a46ef74948e0c59a144db07c9f296933
font_01_sfnt_off0000da30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 10548 bytes
SHA-256: 5b95975f574ba8e84e7eaa55b4ecf950b207c42c2004af398192e6e9e720fced
font_02_sfnt_off0000fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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