Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fb6834a045a710…

MALICIOUS

PDF

76.8 KB Created: 2020-11-24 17:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19763b948df52c6d62c7c36b275c67de SHA-1: 08bcbf48e8bf48aba794a9324bbc4fdc1fc12329 SHA-256: b6fb6834a045a710c93df220012b325b28bf50038af44177812c0342bb4ee312
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external links, with a specific heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to a Weebly hosted PDF. The presence of these links suggests an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

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://trafffi.ru/aws?utm_term=environmental+monitoring+programme+guidelines+in+pharma
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/xoxerejalud.pdf
    • https://cdn-cms.f-static.net/uploads/4492900/normal_5faf5e29d7e48.pdf
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f97e7adc0e1e.pdf
    • https://cdn-cms.f-static.net/uploads/4493888/normal_5fba12bed11b4.pdf
    • https://cdn-cms.f-static.net/uploads/4380883/normal_5fb9ed07b9259.pdf
    • https://cdn-cms.f-static.net/uploads/4427821/normal_5f9b4251d5900.pdf
    • https://fapusazi.weebly.com/uploads/1/3/4/8/134849501/6975134.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2e5f7564-091f-4665-bf48-80421f30ba9a/2035734952.pdf
    • https://uploads.strikinglycdn.com/files/c3ecbc5d-bd6c-4139-82d6-2fca18c8c310/68828985973.pdf
    • https://s3.amazonaws.com/pusolefosex/elearning_for_you_care_certificate_answers.pdf
    • https://uploads.strikinglycdn.com/files/7d1fcba1-9c8e-46eb-927b-cf81ea2a3517/nizezumikatiwigereliwaz.pdf
    • https://s3.amazonaws.com/legenapi/59398829723.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_off0000ee59.bin
bd00196a33cde6b7578e9bb83143a1154f6bb7df5cb891542f95dc1af6003f4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 5392 bytes
font_01_sfnt_off00010084.bin
05437c7da840d3f2b03bee9a4dd64f809caa54fb6ccaff3903486db998c28451
pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 11116 bytes