Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced837e3e7c68e5b…

MALICIOUS

PDF

76.4 KB Created: 2021-02-19 08:25:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a8d171723c2d5bd72182e398033fd768 SHA-1: dbcc5068e0c6768806a58eef4ba11ebc9d9588c6 SHA-256: ced837e3e7c68e5b219b781dee603ac30a902bd22e7cf556a683d82cc58091d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 5

  • 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 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://baarspo.ru/strik?utm_term=nanostation+loco+m2+ap+repeater PDF link annotation
    • http://vegixojarek.iblogger.org/xofekizobudedak.pdfIn PDF document text
    • http://lavkavkusa.store/91779046218nvjk8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374175/normal_60049dc815b1f.pdfIn PDF document text
    • http://varistop.site/36606333765n1tsr.pdfIn PDF document text
    • http://agreevudb.rest/fluke_789_price_malaysiapfpri.pdfIn PDF document text
    • http://rating-bookmaker.ru/are_employee_stock_options_worth_it4e8r0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5fe657f82d779.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_5fe7f27db19d3.pdfIn PDF document text
    • http://english-10.site/xusedezi9g67x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_600b3fed4476e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489057/normal_5fd03be4ed96f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_5fd7a90b592ac.pdfIn PDF document text
    • http://albatros-trans.ru/best_washer_and_dryer_set_dealssq7sy.pdfIn PDF document text
    • http://interstart.online/joritekadixaxokinabivfj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480595/normal_5fd90232484fc.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/c6lgJhj/57992386686.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://birotizedu.epizy.com/425176359.pdfIn PDF document text
    • http://vavubal.epizy.com/android_rooting_apps_without_computer.pdfIn PDF document text
    • http://wepexivir.epizy.com/gasakanazifumabikevidopew.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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 5180 bytes
SHA-256: 1bff3af70f81bb8fc15e17dbc8c7f8d15fcfa8f5404be85799440e19d4f3e05b
font_01_sfnt_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 11476 bytes
SHA-256: 653d520d8b819e49bbe211fc634774587ddd56ac738016083cc1f579f4a65959