Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d25b6aeb336860…

MALICIOUS

PDF

70.3 KB Created: 2020-11-18 12:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1f664bda1297b8edafc834b6a8c7ba73 SHA-1: 190471cdef8b57345f69a3c30e56f28bd2700122 SHA-256: 21d25b6aeb3368608e5def63706b2c7309add401a52435956e46b8c123b0f2cd
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic firings indicate the document is designed to link to a large number of PDFs, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffking.ru/strik?utm_term=download+the+ultimate+3d+print+quali In PDF document text
    • https://miremewokar.weebly.com/uploads/1/3/0/7/130738658/fuwadujer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5f99fbc280584.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/b888f77794cd.pdfIn PDF document text
    • https://dumejolizaxoko.weebly.com/uploads/1/3/0/8/130814858/c4d6f7cf.pdfIn PDF document text
    • https://negiwonilelif.weebly.com/uploads/1/3/4/5/134583179/wetuxemekiwur_gajopelub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379964/normal_5f9b0748ef319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f8fb0810a556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_5faefe7caab9c.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/fajixe/raldbthar_deep_market_puzzle.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/25296805604.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/webenowufumapamapureka.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_off0000c91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91D 5284 bytes
SHA-256: 82f98a00c523d9f27a97b355d9a71c00b2b9123f00782130c3a84262c08c55fb
font_01_sfnt_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 10264 bytes
SHA-256: 98832ac8726b14e4af8a24676f398f03d6de97e3939b7d02b2f2d0a49088801d
font_02_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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