Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dd1759444b3fee…

MALICIOUS

PDF

81.4 KB Created: 2021-02-04 06:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ef232a0ecca4cf65844c103d87372a1e SHA-1: 5950c8582db41914e7b394d857778dae40067565 SHA-256: 79dd1759444b3feea492234a2b6b3d1d11e9003d2b60ed9ab4f3b8677301a786
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating phishing and trojan characteristics. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to external sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

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://jacksth.ru/aws?utm_term=beyonce+single+ladies+mtv+vma+2009 PDF link annotation
    • https://cdn.sqhk.co/ralapogifur/cjfwKji/karaoke_sing_karaoke_voice_recorder_singing_app.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/ihFKhhj/solucion_high_school_escape_level_8.pdfIn PDF document text
    • http://tizezs.xyz/sees_candy_truffles_guidex9d9a.pdfIn PDF document text
    • https://cdn.sqhk.co/gexopoku/7HjAhfv/labibuwunimakejefo.pdfIn PDF document text
    • http://alphabitx.com/cataclastic_metamorphismjf23q.pdfIn PDF document text
    • http://kadesevi.iblogger.org/game_crisis_action_free.pdfIn PDF document text
    • http://auto-fishing-rods1.club/bcycle_houston_promo_codeaxpiz.pdfIn PDF document text
    • http://votewimuvuxa.iblogger.org/29282642724.pdfIn PDF document text
    • http://italia-doc.fun/comic_reader_app_downloado7mti.pdfIn PDF document text
    • http://fionainthefield.org/femiwijakivlsg5.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/chaidic/virus_removal_software_free_download_for_pc.pdfIn PDF document text
    • http://zupibupiju.iblogger.org/cisco_1000base-_sx_sfp_datasheet.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://tuvadovu.rf.gd/fupegesiz.pdfIn PDF document text
    • http://virefixifefuke.epizy.com/robuwi.pdfIn PDF document text
    • http://zikukoji.epizy.com/20887726224.pdfIn PDF document text
    • http://lojifasipok.rf.gd/atika_school_biology_notes_form_2.pdfIn PDF document text
    • http://vebavibokifoko.epizy.com/felebatigukil.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_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 5592 bytes
SHA-256: 0e66030f8f8f2c97a0519d17999b8990cf916fa8567e3dfb6409ca8662b6d8c3
font_01_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 11572 bytes
SHA-256: f2e85498957b280b4984a6d83499604e83dc5984a43226483357e1421c4b633e
font_02_sfnt_off000129ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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