Malicious PDF — malware analysis report

Static analysis result for SHA-256 9581e9895b9fecd7…

MALICIOUS

PDF

71.3 KB Created: 2021-02-20 17:01:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 404cdaff3d74009a78596cbdb679f2e1 SHA-1: 4ecaf8b0df82395b57b8aa78a529331831bbf80f SHA-256: 9581e9895b9fecd79a19311fbe0eb7f5b0de4e6a5f8e120c36a2cd55ac4beec5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://jacksth.ru/strik?utm_term=how+to+clean+a+whirlpool+duet+washing+machine', is likely part of this scheme to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=how+to+clean+a+whirlpool+duet+washing+machine PDF link annotation
    • https://gotenalonas.weebly.com/uploads/1/3/4/3/134372716/3c8b77c3b24df83.pdfIn PDF document text
    • https://wepebajaka.weebly.com/uploads/1/3/4/5/134588919/5581098.pdfIn PDF document text
    • https://fawezodotemo.weebly.com/uploads/1/3/4/8/134871545/49b2127708a.pdfIn PDF document text
    • https://bativazuwa.weebly.com/uploads/1/3/0/9/130969541/kovukekig-nasizen-fizobodino.pdfIn PDF document text
    • http://papotupeti.iblogger.org/23893141008.pdfIn PDF document text
    • http://agreevudb.rest/what_are_the_major_types_of_production_processesfyirj.pdfIn PDF document text
    • https://xuwudobuxu.weebly.com/uploads/1/3/2/6/132682441/6193248.pdfIn PDF document text
    • http://yoga-italy.space/71728308226tc2w5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5fea0e3e4e3ec.pdfIn PDF document text
    • https://nudadisaxoge.weebly.com/uploads/1/3/4/0/134018155/dfda37e3.pdfIn PDF document text
    • https://kizuzeno.weebly.com/uploads/1/3/5/3/135326612/wafiw_mivejavisu.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/wunigigowipuga.pdfIn PDF document text
    • https://rogupogadagome.weebly.com/uploads/1/3/1/3/131398605/158c3f46edc5.pdfIn PDF document text
    • https://fakozopaximubod.weebly.com/uploads/1/3/1/4/131453484/10531b6f44.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubuvajaroxe.epizy.com/itv2_plus_one_guide.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_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 5540 bytes
SHA-256: 8d62d873939e72f856b472839cfb13a103e6111ea830ee9254ecce7c3c53eb69
font_01_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 10272 bytes
SHA-256: fbad686e6bc39bf28cc6dab053e836e8c58dc8d22f1ddcc33015801be8cd6001

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