Malicious PDF — malware analysis report

Static analysis result for SHA-256 868b1b2cf466689d…

MALICIOUS

PDF

71.4 KB Created: 2021-02-27 03:06:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 05c1a82f597ad7fa62b032ddda7a673c SHA-1: 79baebaee588d04b24662b7b759309f494546747 SHA-256: 868b1b2cf466689de75f65d2f4857a377d5c023307ac056f78645fb80b7b7d3e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a suspicious domain ('druttle.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to disposable hosting, further supporting malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://druttle.ru/strik?utm_term=how+to+reset+a+kenmore+washer PDF link annotation
    • http://redpandarecycling.com/usmc_dress_blues_uniform_inspection_checklistrlrhh.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/eje3o4E/54412650958.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/51578741311.pdfIn PDF document text
    • http://adanakebap.org/football_referee_costume_mense23qn.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/iigijbe/mexican_american_football_team.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/UidibAA/tumedabizumetaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoveted/pjh46oB/youtube_luke_bryan_one_margarita_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/5gggcX7/rokezibuxowanok.pdfIn PDF document text
    • http://felidefewipikig.22web.org/how_to_cook_boletus.pdfIn PDF document text
    • https://cdn.sqhk.co/gumoxixo/9gcicih/lalewawabunuv.pdfIn PDF document text
    • http://sadovik.me/daru_pini_band_kardi_remix_mp3_downloaddi2tu.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/6475344129.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakelasu.rf.gd/superannuation_rollover_form_australia.pdfIn PDF document text
    • http://wazozugafen.epizy.com/everquest_p99_druid_leveling_guide.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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 5008 bytes
SHA-256: a8f22a53a2a3f3f2088d0ae7fcd296e8b848ce9abcd1b35ea74385c2ebe33bab
font_01_sfnt_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 10892 bytes
SHA-256: 47c549a1543a1cf57a18abdb6f4657d00829f39dc83c79af50d9f183531921de

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