Malicious PDF — malware analysis report

Static analysis result for SHA-256 847b4065937f52cd…

MALICIOUS

PDF

68.6 KB Created: 2021-02-19 08:14:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 47d64fb825698d03a364a9a4be35d16a SHA-1: 494b4124b8ff0fbb58b18cc10cdc8c29dd3ba343 SHA-256: 847b4065937f52cd89ffb9cefb8139f00a4c2f3c16ec8749579c8a6755b25933
186 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, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The presence of a critical heuristic for PDF SEO link farms and ClamAV detection as Pdf.Phishing.Trojan strongly suggests malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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
  • 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://crophysi.ru/strik?utm_term=word+vba+selection.find+count PDF link annotation
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/foxikiled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_602b61338f0b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_602d08c43196c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459784/normal_6022d9722dc07.pdfIn PDF document text
    • https://cdn.sqhk.co/nijazulagoza/jiohjgZ/silver_dollar_city_christmas.pdfIn PDF document text
    • http://foyou.store/three_course_menu_templatevhzfi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421061/normal_6010f61de01b8.pdfIn PDF document text
    • http://tefukuk.iblogger.org/arcade_games_free_for_mac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426572/normal_5fc647d0c85b4.pdfIn PDF document text
    • https://cdn.sqhk.co/vusutazomaga/w9ichj4/roblox_promo_codes_october_2020_youtube.pdfIn PDF document text
    • http://karaulovlife.site/123318784945ll3n.pdfIn PDF document text
    • https://sopoxovolofu.weebly.com/uploads/1/3/4/5/134509961/tubujefaxudazon.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxubefe/Mzjjgdv/dadez.pdfIn PDF document text
    • http://lifeeuro.info/fsa_id_creation_worksheetpzcvp.pdfIn PDF document text
    • http://graatorama.fun/ginajuxexifeferotiwunufh3lnc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392668/normal_5fe54333d1cfa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5ff27496842f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tesunujazo.epizy.com/combine_data_from_multiple_sheets_to_one.pdfIn PDF document text
    • http://dejomogilum.rf.gd/20029058166.pdfIn PDF document text
    • http://xurebamokasepa.epizy.com/venog.pdfIn PDF document text
    • http://luwegovufa.epizy.com/ccna_data_center_sybex.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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 5260 bytes
SHA-256: d8ec5131bcc270f08ddcaa5e0bc703a1f09d8aed33324c4de3b6c28b8a859b60
font_01_sfnt_off0000df47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF47 11396 bytes
SHA-256: 7e20f3a4ee5a78ed8b6d8d208182c1cce70cef9e0cf0653f466b54e563f05951

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