Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4a1bc014f62442…

MALICIOUS

PDF

84.8 KB Created: 2021-03-01 02:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06fca107a1c8918ab65e34f5f2c44ab2 SHA-1: fb0402735d77e130036fa6a07e6cc221446a2d9b SHA-256: 6d4a1bc014f62442336d8117b25d431cc65ffb17b2151c982f5bfebe4355d849
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The document body, though heavily obfuscated, suggests a lure related to software serial numbers, directing users to external links that likely host further malicious content. The presence of multiple disposable domains and link farms indicates a phishing or scam operation.

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://golowaki.ru/123?utm_term=adobe+illustrator+cs5.1+serial+number PDF link annotation
    • https://cdn.sqhk.co/zafupusapun/FhhSgdr/muxexoxigezoxibigoxowepa.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/ihaTihg/tizevudaluxagopisubuwiki.pdfIn PDF document text
    • http://creditreportfast.info/who_did_kvothe_killolgxv.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/1Ngjih1/kozuxakavirinapixasegatif.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/is_cloud_reliablem8y7n.pdfIn PDF document text
    • https://cdn.sqhk.co/tajalawad/iedKSja/tawenewifuxogu.pdfIn PDF document text
    • http://lofitner.buzz/bush_and_gerts_baby_grand_piano_valuemrucg.pdfIn PDF document text
    • http://matrixbicycles.com/drawing_book_design8wihe.pdfIn PDF document text
    • http://romeoplanet.club/fafisijoju7yy7g.pdfIn PDF document text
    • http://jumbochecker.com/khiladi_bengali_movie_song_320kbpsoqh66.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/dauntless_ps4_sword_guidext9ps.pdfIn PDF document text
    • https://cdn.sqhk.co/sixerusesebu/hbOQQkV/virtual_families_3_cheats_mobile.pdfIn PDF document text
    • http://springital.fun/honeywell_thermostat_th6000_installation_guideeb2ca.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/kozibowisenatu/avg_pro_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/dejidesabukasuw.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/bibamaze.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/bubbles_shooter_game_free.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_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 5420 bytes
SHA-256: 2b18a69f6e2ccbf55e3047bf56a254167f68d5d22be53dbd0b7f2d971c7559a2
font_01_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 11120 bytes
SHA-256: 2f03589f00c055e17a1d239fb735e13a0c356e3be48b4a51580557cbf942bb28

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