Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb3deca0e586a7c…

MALICIOUS

PDF

69.6 KB Created: 2021-02-15 05:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 086d950970832359da0e56075339c1eb SHA-1: 2fffcd6ccf059a0f02e19f3bae723c3b2f5a41fe SHA-256: fbb3deca0e586a7c71207667c66669a2bb0144d243c9dddcb71dbe4a8ae40292
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded links that redirect to known malicious infrastructure, suggesting a phishing or malware distribution attempt. The presence of multiple disposable hosting links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=helio+gracie+master+text+pdf In PDF document text
    • https://cdn.sqhk.co/zekoparan/hJuVjgw/ninja_dash_kill_jump_and_run_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zodozane/mK0ltie/jekag.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/j6knIku/93585346650.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/ytDihso/xoxamewowa.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/1Hi5ifl/jikodapatepatekig.pdfIn PDF document text
    • http://savetewolixoful.iblogger.org/crosses_involving_multiple_alleles_worksheet_answers.pdfIn PDF document text
    • http://redpandarecycling.com/740600767299ozm8.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/lRfjgjh/guess_the_emoji_movie_bollywood.pdfIn PDF document text
    • http://civiliscmq.online/jotixapuvofitowebabejfc4zp.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/zunaduxa/def_of_baculiform.pdfIn PDF document text
    • http://suluzisose.rf.gd/ejemplo_texto_descriptivo.pdfIn PDF document text
    • http://sulifuzefusuw.rf.gd/27562567981.pdfIn PDF document text
    • http://piwuzodoxomox.epizy.com/94049055596.pdfIn PDF document text
    • http://babupit.epizy.com/nipabofolipuvafipipomate.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_off0000d346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD346 5504 bytes
SHA-256: 6068013a42eb6a5ebf7528a68271b9a1a8f753de299687966432ad67798b6b17
font_01_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 10276 bytes
SHA-256: e04d1cab8f4ab19e6966fc12fcfa09b096923ce1e0ccd4e42a1ece5ee5dc0dde

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