Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5660a2bce98071…

MALICIOUS

PDF

81.7 KB Created: 2021-01-01 01:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: debf8ac03a05e0898e84ac7d69671781 SHA-1: 7576c74a632447c814128d9affd9fbc1e8fb3fde SHA-256: ff5660a2bce98071f938f4b9e84f39a1af56be80d35e9f9fc0ea73e63809673b
304 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document impersonates Instagram to trick users into clicking a link, likely for credential phishing. The embedded links lead to a malicious redirector and a link farm hosted on disposable domains, indicating a phishing campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/sotebufamapon.pdf.
  • 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.
  • 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://traffine.ru/strik?utm_term=followers+app+not+letting+me+log+in In PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/sotebufamapon.pdfIn PDF document text
    • https://wipiduwofudozi.weebly.com/uploads/1/3/4/5/134588456/raravuzefeke_wiwisomedas_kokofurasi_xirexo.pdfIn PDF document text
    • https://jarofudi.weebly.com/uploads/1/3/1/4/131408364/9680fa607.pdfIn PDF document text
    • https://duvutotan.weebly.com/uploads/1/3/0/7/130775700/revaxafo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fb27a0686aa6.pdfIn PDF document text
    • https://jadekida.weebly.com/uploads/1/3/4/3/134349878/00b7f70787.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/rovebadivuv-jebotivedoke-timisidagajare-gobupidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_5fbca6b496c1b.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/892833c.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/pokorevalaxex/21503623623.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 5188 bytes
SHA-256: 53420e1c450363b169beb96898e7971ae148ebba2081b19987a1a441f7a90886
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 11304 bytes
SHA-256: cafa815d8506b0b0cf1318a467dc2a859d8dfdcaa4dacaf09ab3f598a77010b8
font_02_sfnt_off000122ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 16568 bytes
SHA-256: b55043b3d3e10bb30762ff8ddf973a992d78b14c5ee1a2518073678cb3397904

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