Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ce08b677f2da38…

MALICIOUS

PDF

77.0 KB Created: 2021-04-08 16:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e5dd9920c61e5d7b78f7dd7a86051cea SHA-1: 223296fb065a2f6022fcaf3161b1f48285634463 SHA-256: 15ce08b677f2da388d48234dd58ccc003ecb1b70f812189997fb74041eaf0d33
184 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains embedded URLs that redirect to known malicious infrastructure, specifically `https://yafferge.ru/strik?utm_term=on+the+road+lyrics`. The PDF structure and embedded links suggest an attempt to lure the user to a malicious site, likely for phishing or to download further malware. No scripts were extracted, but the presence of malicious redirectors is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://yafferge.ru/strik?utm_term=on+the+road+lyrics In PDF document text
    • http://fofiwafajelerax.sportsontheweb.net/gobugabubezisekob.pdfIn PDF document text
    • http://dafokuwagabe.22web.org/7462140609.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422890/normal_5ff71b911d13d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_60642f65b9924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_603fa54359f12.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/72_king_kutter_finish_mower_parts.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/071a125c-4761-4e62-ae93-c0d3dad2f535/xutigenesegalefewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f09aafd-802d-4893-95ff-ca5c2eea78ea/53400437895.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/tejel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0dd0d6-6291-4528-990b-e82903e1904e/how_to_replace_samsung_washing_machine_door_seal.pdfIn PDF document text
    • http://jejesufunaderuv.rf.gd/8884672248.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/716354251.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70da7872-ab25-4522-bd50-8cacbb34d59d/74225036873.pdfIn PDF document text
    • http://binuwuzipu.myartsonline.com/pesozanavosatanoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56e569cc-3976-4672-8c06-8c9f6f3542bb/71780134867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6cf0c07-4ef1-42b0-bf2f-ccaf0583cfcf/surofubuludofiv.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_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 5156 bytes
SHA-256: 08ebccd01757f601c7cd28f35dacc8c7659ff9f615e4fa136854b665567d4c14
font_01_sfnt_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 11488 bytes
SHA-256: f7b09ffa91871c74e07aee4b26ee52b9df5f731766125975b777b9020320cf7d

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