Malicious PDF — malware analysis report

Static analysis result for SHA-256 2050b5285306a9b1…

MALICIOUS

PDF

75.7 KB Created: 2021-01-26 11:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8b042aa756339b762c9bdda510d66a05 SHA-1: 022ac7fbc84bd68566a1d498dc95a8a3261c6b08 SHA-256: 2050b5285306a9b1514aecfd8e848fd63cb844ec498677767ef705d6a1ba37e3
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating it functions as a link farm. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this behavior, with many links pointing to disposable hosting. The ML classifier and ClamAV detection further confirm its malicious nature, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://druttle.ru/wb?keyword=dreamer%20song%20beatles PDF link annotation
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/xemuxafipadesukan.pdfIn PDF document text
    • https://cdn.sqhk.co/soboxuxafiso/jiiageq/war_of_the_worlds_epix_review_episode_2.pdfIn PDF document text
    • http://helper-badges.com/espn_streak_notificationssavwk.pdfIn PDF document text
    • http://streichpack.online/27821179842v5n69.pdfIn PDF document text
    • https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/df683617953f.pdfIn PDF document text
    • https://cdn.sqhk.co/xadowififux/djbiegh/gumball_machine_maker_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/jijhmia/electric_guitar_brands_ranked.pdfIn PDF document text
    • http://efarbok.xyz/6682045247673476.pdfIn PDF document text
    • http://copyrightnotice-ig.com/42721456310ept9a.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/6sIAgG1/assistive_touch_not_working_after_update.pdfIn PDF document text
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/kuzaxazujij.pdfIn PDF document text
    • http://generalmassage.online/dimanolikalevfh1h.pdfIn PDF document text
    • http://conicppjry.bid/spinel_gem_colorsc3vty.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/jc0idhc/bejewivivipajavodekix.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/hRhiPje/cennet_todo_vuelve_novela_turca_capitulos_completos.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/setaxilitozuko/befilewadelopejozofomo.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_off0000ed73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED73 5144 bytes
SHA-256: e550d558c0703c7301690abd7366dfe99622433140cef5bf662a68f26b2b2461
font_01_sfnt_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 10304 bytes
SHA-256: 1a8e5639070b00a0391b6ebc6fde084ccb74010e3211ce2c4b506ee5b98bc626

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