Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86efeedc2a84f35…

MALICIOUS

PDF

65.9 KB Created: 2020-11-20 13:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d86e46a8a39968e817c4d7bc3cab3aa7 SHA-1: 71c154a932e194af9b6fa87abf9131cd5e6b343b SHA-256: a86efeedc2a84f3585d15b02e66b63bac12efabc97f071f169de4bf1c6151187
164 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with one pointing to 'trafftec.ru', suggesting a potential link farm or redirection to malicious content. The document body, though heavily garbled, contains text related to a 'cissp issap study guide pdf', indicating a lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafftec.ru/123?utm_term=cissp+issap+study+guide+pdf PDF link annotation
    • https://fapadeli.weebly.com/uploads/1/3/4/4/134445247/2387229.pdfIn PDF document text
    • https://xinifusat.weebly.com/uploads/1/3/4/3/134321574/kuduwavemumobiz-ligij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_5f9bf09a4ff89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466673/normal_5fab97179401b.pdfIn PDF document text
    • https://danawejenig.weebly.com/uploads/1/3/4/4/134499985/muduwuku.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/vimimijidife.pdfIn PDF document text
    • https://bekijarodik.weebly.com/uploads/1/3/4/6/134617997/7237958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409393/normal_5f9b70694b5c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f8748699ef01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/chemistry_book_10th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/11953611026.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/administracion_y_absorcion_de_farmacos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55A 5088 bytes
SHA-256: fdaa903af3ac7981507d447bf536f9522854ee369656def761a516f4a87ca50e
font_01_sfnt_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 10688 bytes
SHA-256: 1a7182553e07567c722144a6479eea2fb34d59dec0203d5309c99a86924c5374

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