Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1bd376880e0a61…

MALICIOUS

PDF

89.1 KB Created: 2021-02-05 04:59:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 41904918c88a63ff82a233ea4a61460b SHA-1: d8f8bcf13a267d9eecab784409688c90dcc3b515 SHA-256: 9f1bd376880e0a61235bc6d6823c1ae9bff925aad472cb18d5a007ddec215e45
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to redirect users, likely to a phishing or malware distribution site. The presence of an external URI pointing to 'jacksth.ru' suggests a phishing lure related to iOS public beta releases.

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=ios+13+public+beta+6 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5ffb51fa96656.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepedamaxa/hghhugg/cute_gacha_life_outfits_bad_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/ifhauib/best_romantic_movies_2020_bollywood.pdfIn PDF document text
    • http://money-team.site/warezeguvuvolqq241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5fdedaf085cff.pdfIn PDF document text
    • http://nout-sale.site/fulltone_ocd_manual_1.78929f.pdfIn PDF document text
    • http://natiral.space/27856261133hy6h4.pdfIn PDF document text
    • http://idealica-it.website/expanded_form_worksheets_for_1st_grade25ijc.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/hib1EOl/68974712232.pdfIn PDF document text
    • http://gratoraama.space/vigovifokunipx05jg.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/jbEnCid/bdo_reload_not_working.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/dozuga/fmla_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/tegunuti.pdfIn PDF document text
    • http://vezapuro.rf.gd/84353696458.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/69457728080.pdfIn PDF document text
    • http://xibubew.epizy.com/cannibal_movie_2013.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_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 5276 bytes
SHA-256: 5ed5ab3ba672a9365036fc8221d4aeac6a166499564fd53eb93034eecf7ac991
font_01_sfnt_off00013048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13048 11684 bytes
SHA-256: eeebcb9d390e7ddde7dac9c131ede847b0c52475a416bdc7a93905678f8adddc

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