Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6f14657a21e527…

MALICIOUS

PDF

100.3 KB Created: 2020-11-17 14:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc417b3ebc60a4b1efb778d119fc2bfc SHA-1: d612987b7effb66d5dd5b062f455cde94f6cccf5 SHA-256: 8a6f14657a21e527eab9a5ea45096e64d8c3bd6e2b4b188e1a64dee59af3c360
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO link farming. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=mexicas+ubicacion+actual
    • https://cdn-cms.f-static.net/uploads/4453537/normal_5fad32b91f341.pdf
    • https://tupetipu.weebly.com/uploads/1/3/4/4/134489263/nexudoje-dofam.pdf
    • https://cdn-cms.f-static.net/uploads/4378386/normal_5fafbeb19dabd.pdf
    • https://wuwilosuz.weebly.com/uploads/1/3/4/3/134394730/6111715.pdf
    • https://cdn-cms.f-static.net/uploads/4418783/normal_5f9ecc13d9cba.pdf
    • https://cdn-cms.f-static.net/uploads/4382421/normal_5f93080222101.pdf
    • https://pawapuso.weebly.com/uploads/1/3/4/3/134312868/3130454.pdf
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5faf47106102b.pdf
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f8ab04a0bdf1.pdf
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.pdf
    • https://cdn-cms.f-static.net/uploads/4388293/normal_5f9fe29eea6ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3dadade1-a835-4d5b-9307-e4db180150c1/85067831214.pdf
    • https://uploads.strikinglycdn.com/files/5acd7a59-dc9c-439b-bb14-d032f9428a60/nodujilifevigale.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ed8.bin
e0b7ce69315b9298bb719410bbef11c351728015f3c53b10de2d0b6d7e5535ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED8 4912 bytes
font_01_sfnt_off00015fb1.bin
21ebaad689693629813493c159a92cbf4bed3da2f08daa080ae6d128a0634477
pdf-font-stream PDF embedded font (sfnt) at offset 0x15FB1 11028 bytes