Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ac0237d647314e…

MALICIOUS

PDF

105.8 KB Created: 2020-11-21 16:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 80db95c124819a979694f6232e471a5a SHA-1: 3246aafccc29c10f53bdc216ea46368fe583c733 SHA-256: 98ac0237d647314e3498bc7d2d5ed282d4b9b8a0e3252fa78b2be90963301706
176 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 heuristic indicating it is part of a link farm, with numerous external links. One prominent URL, 'https://traffnew.ru/123?utm_term=arthur+blank+net+worth+forbes', is directly embedded and appears to be the primary lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://traffnew.ru/123?utm_term=arthur+blank+net+worth+forbes PDF link annotation
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/bibalake-nobugefotalub-gavavegekuzow-ralifasiwekup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f9ed7b5d9a14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f93aad89416c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378170/normal_5fa84f1e2a28e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419424/normal_5fa9b70be2fb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f8bf9d6b92e7.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/gedesisumi/black_maltipoo_names.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/lalobakow.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/miss_universe_philippines_2018_question_and_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/que_significa_chona.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/negadezimomose.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/89369690494.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/37723206277.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/simple_accounting_ledger_template.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_off00015e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4D 5140 bytes
SHA-256: 871d21df75361e2c048afd2c6c3ffa9b6a0098e57fc220713fb58f50a4434564
font_01_sfnt_off00016fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FD3 12660 bytes
SHA-256: 586f01c3888ff34f9ce0ccae0ec56b76f26bb36f7695bf01f26f2878eb92f18c

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