Malicious PDF — malware analysis report

Static analysis result for SHA-256 330b1a10e00203c8…

MALICIOUS

PDF

83.3 KB Created: 2021-03-01 04:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c577fcc8f8dd3cb32056905c987a3ddc SHA-1: 286d379ab94122f2036bfa4a5cff9dd760384266 SHA-256: 330b1a10e00203c882ea57c846fe70f1a99e421def0c5c6e311309705a897650
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter related to router issues indicates a social engineering lure to trick users into clicking the link.

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/strik?utm_term=why+my+linksys+router+won%2527t+connect+to+internet PDF link annotation
    • https://cdn.sqhk.co/genopeno/haFiaja/kegija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5fd236bb8ea2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478927/normal_6018eda357c98.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/12492192692.pdfIn PDF document text
    • http://rojoguladewex.iblogger.org/samatuwiguneri.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/96943178112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460449/normal_6032f13a3bfd4.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/gcwKihD/3343706266.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/Akib33N/50012298220.pdfIn PDF document text
    • https://cdn.sqhk.co/disarelas/d5hjjgo/police_siren_ringtones_for_lg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sebokegekesuded.atwebpages.com/124946261.pdfIn PDF document text
    • http://bidexegope.epizy.com/movies_tamil_padam_ing.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/bosch_dishwasher_shem63w55n_installation_manual.pdfIn PDF document text
    • http://bolapapuziku.epizy.com/this_book_loves_you_review.pdfIn PDF document text
    • http://nawixiduwataluk.epizy.com/nojudufafisorewifegilede.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_off00010b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B72 5136 bytes
SHA-256: 50084a03961145dccb623fd43f370d397c95787f86744f684fb74910fe0d50e5
font_01_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 10372 bytes
SHA-256: 7ededb218b2117403659352f9a5f6566b382a0e25ce2fc312604cce7d12cd911

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