Malicious PDF — malware analysis report

Static analysis result for SHA-256 7117f8829ca5f141…

MALICIOUS

PDF

63.3 KB Created: 2020-11-10 04:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50e8c48f207d85097692a25bc96ac776 SHA-1: 9967feefddbc08c145f6de7f78f85374281e3de0 SHA-256: 7117f8829ca5f14171d7af0cdd0ff7f48a9c3ee2ba1ba3fa7303e0daf5e22280
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs points to 'traffine.ru', suggesting a redirection to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam campaigns designed to drive traffic to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/strik?keyword=alfred+adler+theory+quizlet
    • https://joguxakiwemov.weebly.com/uploads/1/3/4/7/134707067/315500.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.pdf
    • https://bajewenizuku.weebly.com/uploads/1/3/4/4/134475359/d66e7f5984d.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/zipufag.pdf
    • https://sixifemawo.weebly.com/uploads/1/3/4/4/134470876/7097824.pdf
    • https://cdn-cms.f-static.net/uploads/4365661/normal_5f883e54c93e2.pdf
    • https://cdn-cms.f-static.net/uploads/4392853/normal_5f902d8cc6b7a.pdf
    • https://juvikenozenukun.weebly.com/uploads/1/3/4/3/134322787/1122158.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1162d4dc-1550-4ede-b1bf-ffcae0297482/72843802426.pdf
    • https://s3.amazonaws.com/purawuma/zarandas_de_alta_frecuencia.pdf
    • https://s3.amazonaws.com/xaliwalufoguni/the_it_department.pdf
    • https://uploads.strikinglycdn.com/files/23b0d744-b243-4c84-ad54-4051633700bc/cow_eye_dissection_lab_guide_answers.pdf
    • https://s3.amazonaws.com/varolexexus/no_se_iluda_no_resumo.pdf
    • https://s3.amazonaws.com/pewibim/marriage_certificate_format_download.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_off0000bb26.bin
4f556610642f299a1e1b52f1e5c0610438225008ea42f6357fc9e3c49d8e8576
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB26 5084 bytes
font_01_sfnt_off0000cc7d.bin
9d1bf19c2101ee8ec6b6b6849e27f389d24ea17345df1affa0c77ec63051ff74
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7D 10284 bytes