Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b31cc7754f1a0f…

MALICIOUS

PDF

68.2 KB Created: 2021-04-28 13:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6bb9d6b4f3873e8cd28d14aa34999e82 SHA-1: 245b53d28f6ffd907d194c96b0c413f26e726686 SHA-256: c0b31cc7754f1a0f974bca0da6eae25abff8077617b836ee7e6c8ee8e7414fca
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with embedded URIs pointing to suspicious domains. The presence of a 'download button' heuristic further supports a lure-based attack pattern. No scripts were extracted, but the overall structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/strik?utm_term=holistic+tarot+pdf+download+free PDF link annotation
    • http://lasns.fun/46188909082jmz6v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418587/normal_6041d3105f80d.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/cFhgkyL/14402878367.pdfIn PDF document text
    • http://znohist.site/how_to_practice_rhythm_with_metronomexca5d.pdfIn PDF document text
    • http://juzisil.22web.org/love_hurts_quotes_in_tamil.pdfIn PDF document text
    • http://idealica-ituficiale.website/fefekaxedotinufirigunames39owz.pdfIn PDF document text
    • https://cdn.sqhk.co/jumuxabag/AE79jio/download_frontline_commando_d_day_mod_apk_rexdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_602b3a7e5a817.pdfIn PDF document text
    • http://strongcreditscore.info/1206913164196idt.pdfIn PDF document text
    • http://lbaranaydin.com/xumasexakuzidyklr6.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/90704343513cg211.pdfIn PDF document text
    • https://cdn.sqhk.co/vabedesi/lie5Uce/wojutixobado.pdfIn PDF document text
    • http://reduslim-eu.site/fozeritufadunatulesesix8urv.pdfIn PDF document text
    • http://koprovk.xyz/112243030545bpps.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dowibisewapidon.rf.gd/college_recommendation_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9421c859-2fac-404c-9218-991b78db8c70/f_table_statistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6611a9-3953-4907-8ee7-f9253edb8168/newtons_first_law_of_motion_in_terms_of_acceleration.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_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 5200 bytes
SHA-256: 8c3f6cdb08adb1a6dc459e46674d0e8d29e8a84cc3e0bc897b208b5c18b8978c
font_01_sfnt_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10784 bytes
SHA-256: 3ef56e910be24f964948acb5edc5d8cdb33b6fa339cfb72bb15a088a9c35db8e

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