Malicious PDF — malware analysis report

Static analysis result for SHA-256 00dc804b4539025a…

MALICIOUS

PDF

86.5 KB Created: 2021-02-20 18:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bd5bc03351ae06dbbec3b6cd1d1d406e SHA-1: b944de7b35795411ed5a36806c6c19ec8015cacd SHA-256: 00dc804b4539025a3da3e01b1a3e1f5ac6e3890b927e365a1bc91a9ea0a816c2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains or Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users.

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://maypoin.ru/strik?utm_term=evenflo+exersaucer+triple+fun+entertainer PDF link annotation
    • https://cdn.sqhk.co/wepunajexiju/aI85wEm/guvanefujof.pdfIn PDF document text
    • https://duxujofibedusor.weebly.com/uploads/1/3/4/5/134577283/veposugitaguk.pdfIn PDF document text
    • https://lurofigugibax.weebly.com/uploads/1/3/4/6/134686006/c28f697fdfdd72.pdfIn PDF document text
    • https://cdn.sqhk.co/sizozizaj/LZjgCk7/zopef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_602edadb73087.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/XicifIH/sezowe.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/3260059.pdfIn PDF document text
    • https://lilafigofuku.weebly.com/uploads/1/3/1/3/131398347/cf4a9.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/yhdifZt/53000544557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_5fd16132dffdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_602c5d6abf10d.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/iabghuv/dragon_models_usa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fccc91e69ab3.pdfIn PDF document text
    • https://cdn.sqhk.co/wovedajuraki/SxTjguV/royal_offense_2_mod_apk_5._3._1.pdfIn PDF document text
    • https://lakojelot.weebly.com/uploads/1/3/1/6/131637836/berilavavam.pdfIn PDF document text
    • https://cdn.sqhk.co/lokovipazal/Ehch5cF/temple_run_3_game_download_app.pdfIn PDF document text
    • https://sufudoni.weebly.com/uploads/1/3/4/8/134853368/3024634.pdfIn PDF document text
    • https://cdn.sqhk.co/rurizibaxami/gidJyja/37750448237.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/xukonakefules/bu_university_bhopal_private_form.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_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 5092 bytes
SHA-256: eac442b75c286b689739e8738aa986086c6e1e58d8767017f639f05b1d6d4883
font_01_sfnt_off00012687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12687 11120 bytes
SHA-256: 56d985d51115a1401509778dc17bb0929cafc2967518c2c619dd075a7f896822