Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9779d1e2d5c5d81…

MALICIOUS

PDF

77.5 KB Created: 2021-02-21 11:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 46535aafe9a961a8818beb9aaa8ab0f1 SHA-1: 6a3ee74a735f068db3c491ac10260a361145d339 SHA-256: c9779d1e2d5c5d814fb1167e816ce45435015529661c87412e9a4f0df0705306
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or scamming. The embedded URLs are designed to redirect users to potentially malicious content, masquerading as a guide for 'How to use zoom 505 ii'.

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://jottigo.ru/strik?utm_term=how+to+use+zoom+505+ii PDF link annotation
    • https://jaluburevajag.weebly.com/uploads/1/3/0/8/130874017/3599425.pdfIn PDF document text
    • https://wifusudufasebo.weebly.com/uploads/1/3/5/9/135992472/4493688.pdfIn PDF document text
    • https://xopugexufejan.weebly.com/uploads/1/3/4/7/134709921/722b71262a.pdfIn PDF document text
    • https://cdn.sqhk.co/metevetufi/94jdsgh/jexosodijidujulugi.pdfIn PDF document text
    • https://toxupenowa.weebly.com/uploads/1/3/4/0/134042648/malefonegitap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_60278a0f42a84.pdfIn PDF document text
    • https://cdn.sqhk.co/sozedikepasu/Rgchgge/wezibelutupipuxinanapivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_600be0db4326e.pdfIn PDF document text
    • https://nofemifi.weebly.com/uploads/1/3/2/7/132710694/1781842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_5fff4d29db16a.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/SJMfiiv/sajajaxuzovasegalefakij.pdfIn PDF document text
    • https://botosedasirewen.weebly.com/uploads/1/3/5/9/135961685/62f4e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383925/normal_5fcd7ad59fe05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_60240eabe77cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378843/normal_60020596419fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajunuximu.epizy.com/nixuroletuduxok.pdfIn PDF document text
    • http://menenig.rf.gd/vavogaxutuke.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_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 4864 bytes
SHA-256: ad3f6c6ed9e143f4f12d1072db580dca777b11c87095d17bc68665313a9bb994
font_01_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 11160 bytes
SHA-256: c0921c871944ad1a206487f1fdcb3f144c179cf7eec98abbcddc05422c5dea49

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