Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8e4366230792e10…

MALICIOUS

PDF

60.2 KB Created: 2020-11-14 03:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ce37914e01f6e6f607a7555c45104b1 SHA-1: d58b94f2a7f4b9839efb09e51c96c3d85f4c3711 SHA-256: b8e4366230792e10a11b2ffdefe03eb01edf25d923236cedef0535ebde7626f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. The presence of a large number of external links, including one to 'traffking.ru', suggests an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/aws?utm_term=yeh+shen+the+chinese+cinderella+answer+key
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f889dcb4b44e.pdf
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5f918fc4b90ae.pdf
    • https://rixapozati.weebly.com/uploads/1/3/4/4/134456921/3548208.pdf
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5fa2b3520f7bc.pdf
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5f8a4ce229a6d.pdf
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5f91a2df24a2c.pdf
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5fabf0dc340db.pdf
    • https://sadoxeliwuduw.weebly.com/uploads/1/3/4/0/134040540/6832889.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6ee8121f-f80b-42c5-b6a1-f7000f87fc69/voxaxuvakizu.pdf
    • https://uploads.strikinglycdn.com/files/82128e9d-1348-482f-b0d6-ef675dae01bf/principle_of_marketing_16th_edition.pdf
    • https://uploads.strikinglycdn.com/files/683f0324-0b3c-42d7-9a58-19107e6830f0/2015_odyssey_manual.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_off0000ae85.bin
a777c25c13b2da8495cec3a12d23f4ea99c67aec4b0368553697a6b74df38527
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE85 5248 bytes
font_01_sfnt_off0000c06c.bin
79624a2fc8ba3c2fdb95c37d1c7c280217c471cff97fc18da366f97f9c893304
pdf-font-stream PDF embedded font (sfnt) at offset 0xC06C 10444 bytes