Malicious PDF — malware analysis report

Static analysis result for SHA-256 09158b3210e5e6d2…

MALICIOUS

PDF

68.4 KB Created: 2020-11-17 07:44:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa8e688bf19ede8c3148f82e30e9a893 SHA-1: 15c3a9b986a68a08dab9c086087ea0edad297d3e SHA-256: 09158b3210e5e6d27e27612d81d4d0d0c4822d71987b4a1fe524240791e876bf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to inmate searches, likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=mohave+county+jail+inmate+search
    • https://cdn-cms.f-static.net/uploads/4420588/normal_5f9832ea937dd.pdf
    • https://cdn-cms.f-static.net/uploads/4393762/normal_5f9dcc6f93716.pdf
    • https://cdn-cms.f-static.net/uploads/4467298/normal_5fa4a3fc032cb.pdf
    • https://cdn-cms.f-static.net/uploads/4447903/normal_5fa76f3f6fee4.pdf
    • https://cdn-cms.f-static.net/uploads/4384633/normal_5f8c6dfa68fc0.pdf
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/c5bb9d6.pdf
    • https://cdn-cms.f-static.net/uploads/4454982/normal_5fa4131795802.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/jogowezokuvaxu.pdf
    • https://matasomorat.weebly.com/uploads/1/3/4/4/134492922/5901370.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c31efb59-eac9-45c4-8e94-a169a2ae2979/thank_you_mama_kid.pdf
    • https://uploads.strikinglycdn.com/files/b6809da5-61e0-47b1-b39b-12577981ba3e/wizodur.pdf
    • https://uploads.strikinglycdn.com/files/33562ef8-8b4e-4f72-8fab-b25364b418a4/54519042883.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_off0000ce8d.bin
b287bd2456642c12eb2f312d9ae730a9d4066c33f79b4de8b25368abbbbb825d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8D 5284 bytes
font_01_sfnt_off0000e074.bin
69bf5ab3ad0f4b86cc5e7f85e837775b3c8167a20a275e00215fd75aa5417562
pdf-font-stream PDF embedded font (sfnt) at offset 0xE074 10684 bytes