Malicious PDF — malware analysis report

Static analysis result for SHA-256 6114473d8d81edf4…

MALICIOUS

PDF

81.8 KB Created: 2021-03-02 10:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9081f4158d86543fa2c6bb777309e671 SHA-1: a50efd63b672cb4b88a634c14ecd8f371025c106 SHA-256: 6114473d8d81edf49aa753b503b4be3f3029f5698b599be1587c21f966d9bc6b
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain (`druttle.ru`) that appears to be part of a link farm designed to redirect users. The PDF's structure and the presence of many links suggest it's a phishing lure or a distribution point for further malicious content.

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
  • 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=humminbird+helix+5+si+gps+g2 PDF link annotation
    • http://gisoboxizaza.mygamesonline.org/94273354323.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/68248443251.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/Qic4Sig/stylish_urdu_fonts_ttf_download.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/ibdmDig/nesitirizetoz.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/ihojfek/zombie_fires_upsc.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/JxPjjjd/maska_zombie_the_walking_dead.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/ibNiegg/craigslist_seattle_pets_for_sale_by_owner.pdfIn PDF document text
    • https://cdn.sqhk.co/faresawuf/qhhhfY0/52349039687.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/zhe7nWv/marktplaats_apple_tv_2.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/pofupuvutepefinatodusa.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
    • http://wiratobut.rf.gd/bell_bike_computer_wheel_size_chart.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/valomasowixife.pdfIn PDF document text
    • http://medexode.atwebpages.com/84760505864.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/job_application_cover_letter_word_format.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/50142814410.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/nikunamufuvuviwu.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/84188260030.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/oedipus_play.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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 5280 bytes
SHA-256: 287d84e591abec07559a97e995075843fbf4246a9474888f740765be7c3a73b6
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 11380 bytes
SHA-256: 588a0783791c3f8b46769adf3f9a4a8f7d2342f33fadf17391d47a2b463e49ad
font_02_sfnt_off00012ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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