Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b26cc2f6197fc4f…

MALICIOUS

PDF

76.9 KB Created: 2021-04-07 15:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 67cd09d535b13285e053ae80314cad45 SHA-1: b144aeb69a4f44f719d2170989cf06dc72fc0bbf SHA-256: 8b26cc2f6197fc4fb074ef66b8954b4c956b71ca7362a495656abae5b889ea4a
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=microsoft+visual+c%252B%252B+2015+redistributable+for+visual+studio+2017 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407064/normal_604e6160e3c46.pdfIn PDF document text
    • https://fipowawebes.weebly.com/uploads/1/3/4/6/134601566/garomoxuteg.pdfIn PDF document text
    • https://cdn.sqhk.co/nurofiwele/hfHGmhb/37175177990.pdfIn PDF document text
    • https://cdn.sqhk.co/lalivaga/gejdifH/birthday_photo_collage_template_free_download.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/49502631020.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/hTkjdic/58733341107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_604159e75ad8d.pdfIn PDF document text
    • http://fanilobepewe.sportsontheweb.net/unir_varios_en_uno_android.pdfIn PDF document text
    • https://xobisajak.weebly.com/uploads/1/3/4/2/134234638/xalufo.pdfIn PDF document text
    • https://cdn.sqhk.co/vovomafejuwa/mAhajcg/forza_horizon_4_xbox_one_code.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/gciihgY/luzelak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369769/normal_605f7582adeaf.pdfIn PDF document text
    • http://dulisakip.medianewsonline.com/rinajusukoku.pdfIn PDF document text
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/4587584.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/seperopogokevedudo.pdfIn PDF document text
    • https://sizadomuwegemos.weebly.com/uploads/1/3/5/3/135335556/paruporobadonejal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d8ed5b-f6cb-4518-95da-69df906fc2e0/pufasiparinaxitotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ce4769-74ab-4635-8ab4-447c63ab4d4a/4027381756.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_off0000eda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 5752 bytes
SHA-256: 640a86f02fd0799763b13d530008fe91cf95e9b84b77a3e7df7149326ba07102
font_01_sfnt_off00010168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10168 10884 bytes
SHA-256: ec9d44fba57a7b3b420c740715cf7c77e40a765c48c27a8b7c9bc1b5ca1d629e

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