Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba41aa0bc92b821…

MALICIOUS

PDF

88.0 KB Created: 2021-01-13 13:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: bc6567259afd00fb212979722ec30564 SHA-1: 5fef94ae0d1c78c1bc0f802d3c1c9be72d7a9bcb SHA-256: bba41aa0bc92b8213816f403257188efd9ff3fa567e63ba9e33fd74c6d35a365
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically `https://traffmen.ru/aws?utm_term=agenda+planner+2019+free`. It also exhibits characteristics of a PDF link farm, with numerous external PDF links, including `https://s3.amazonaws.com/fotepopunaj/93794792074.pdf`. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan-like behavior.

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://traffmen.ru/aws?utm_term=agenda+planner+2019+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_5f9082f7429d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369656/normal_5fde3abf45272.pdfIn PDF document text
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/4411353.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/aPUhhje/musician_s_friend_corporate_office_phone_number.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/fapela.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380068/normal_5ffcf17354360.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/whdY4yp/36007454516.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/fotepopunaj/93794792074.pdfIn PDF document text
    • https://s3.amazonaws.com/xebareto/zetavoruxigopupisixo.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/kogipolibufufojuv.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/types_of_thyroidectomy.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_off00011a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A99 5500 bytes
SHA-256: 43bf7721fc8f732a80613dc24790d354929e34f801b145de0a0a34edcd37ad36
font_01_sfnt_off00012d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6A 11072 bytes
SHA-256: 37b18be32d07de97abdf9e842895bb009ca4e8204d96d2349e932e80627f6bfa

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