Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a188b87656232a…

MALICIOUS

PDF

65.3 KB Created: 2021-02-23 21:54:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0769fceea68fd0f4831044025646339e SHA-1: d52820bbd4ab67493a87d27b845d24f15afed077 SHA-256: f6a188b87656232a18dfbb419440417ca5980f9c7592f048f65353e5749165d6
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with a high ML classifier score and ClamAV detection indicating malicious intent. The document contains numerous external links, many pointing to disposable hosting services, suggesting an attempt to redirect users to potentially malicious sites for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=the+art+of+racing+in+the+rain+dvd+tesco PDF link annotation
    • https://dekamukovesu.weebly.com/uploads/1/3/5/3/135324216/18e6e5ea64275ac.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/b02dcfec05.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/pFGrieH/nifemusetevikimokefa.pdfIn PDF document text
    • https://xasukibumit.weebly.com/uploads/1/3/4/7/134749231/9536070.pdfIn PDF document text
    • https://jajixawu.weebly.com/uploads/1/3/5/9/135992574/setimuluvuzezetodubo.pdfIn PDF document text
    • https://lowobuganigazo.weebly.com/uploads/1/3/1/1/131163610/b150a60739ec4f4.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/9efb478f4.pdfIn PDF document text
    • https://cdn.sqhk.co/jesotipo/jjAggea/kapuzivixonaj.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/idhf8zP/samsung_s3_email_setup_authentication_failed.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/2799677.pdfIn PDF document text
    • https://toxujubew.weebly.com/uploads/1/3/1/4/131437446/7ce35ad978d26d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pirosisob/best_unlocked_android_phones_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/8288470645.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/fantasy_draft_day_cheat_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 5048 bytes
SHA-256: 1327ca6720edd103ebff29806fd179982af0213627d5ff4ac804c8bb4398583e
font_01_sfnt_off0000c43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43C 10508 bytes
SHA-256: 4dd3d6c310b466abb2d9c1b8ac74fee81413fd9a527de24c0b2a338471b43200
font_02_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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