Malicious PDF — malware analysis report

Static analysis result for SHA-256 440c8a0e6d12d086…

MALICIOUS

PDF

70.9 KB Created: 2021-03-09 03:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76fd4eb426ace4305df5df4744f939e5 SHA-1: 3063c25f5d3336287d38360b1245b6a7ab690d78 SHA-256: 440c8a0e6d12d0867ece72cc6809e9b537cc9a539aaae039647246f572c0a7b7
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious payloads. Heuristics indicate a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/award?keyword=botanical+names+of+plants+and+flowers+pdf PDF link annotation
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/fuvoduwilula.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_60307875bdc82.pdfIn PDF document text
    • https://guxiwejibu.weebly.com/uploads/1/3/4/9/134902351/timamedum-sofil.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/fomikufepegud.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/jiroj_misup_gekimifoneka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_601fb2455a01c.pdfIn PDF document text
    • https://medimigo.weebly.com/uploads/1/3/4/8/134864966/runowetorata_golemixeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_602bdb6db2db7.pdfIn PDF document text
    • https://zefimaral.weebly.com/uploads/1/3/0/7/130776827/4941111.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/jafobav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414672/normal_5ff7f40c3c7b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425491/normal_5fecf670e5c60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413456/normal_6013ac9fc6e32.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/fugagadum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://delomubabobuzu.epizy.com/fujigulit.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/arya_songs_telugu_lo_ing.pdfIn PDF document text
    • http://reniwen.rf.gd/reading_passage_disorders_an_overview_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/78637393365.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/goobang_doo_abox_a1_max_manual.pdfIn PDF document text
    • http://dikumetuvo.epizy.com/57051710469.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/backgammon_free_for_windows_8.pdfIn PDF document text
    • http://xupiwepe.epizy.com/91306311266.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 5444 bytes
SHA-256: 52d57e96dec5476651c439af64a7a9682d25aec6b8d7a4f00575c0daf8778a48

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