Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1c8dcfed2b28e9…

MALICIOUS

PDF

72.8 KB Created: 2021-03-11 22:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: afefd1bb37d4cfe0b399c4e34d2e114a SHA-1: 1b4d99c5e8693a20f6f15238434b06dab32a4ebe SHA-256: bb1c8dcfed2b28e9cfa80394cc3e46d08a75735de47cf2b8afbcb0b7a2d5d631
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically pointing to a domain associated with phishing and link farming. The PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

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
  • 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://lozipotod.ru/award?keyword=arcsight+siem+training+pdf PDF link annotation
    • http://nonretloli.site/potexolitazujovwhn1.pdfIn PDF document text
    • http://mini-cam-v2.club/481148291583nez9.pdfIn PDF document text
    • http://wubujogulekaf.iblogger.org/karakteristik_pendidikan_islam.pdfIn PDF document text
    • http://silver35.ru/33002558636qyn31.pdfIn PDF document text
    • http://dunetetemob.22web.org/komagiguxigagomari.pdfIn PDF document text
    • http://totudini.iblogger.org/pisesepavuvupedivube.pdfIn PDF document text
    • http://adminhalil.com/63274273726pivbo.pdfIn PDF document text
    • http://negimemexib.iblogger.org/kuvisubinuwap.pdfIn PDF document text
    • http://mapovepajosoxub.iblogger.org/vsco_apk_full_unlocked_2018_iphone.pdfIn PDF document text
    • http://rubyshup.space/epson_xp_800_specsqsexn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalevejuzerunir.epizy.com/jejupisikitefuzavitut.pdfIn PDF document text
    • http://numaripokusuj.rf.gd/how_to_reset_service_engine_soon_light_2009_nissan_altima.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/75630126084.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/playstation_3_remote_control_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/alcatraz_facts_sheet.pdfIn PDF document text
    • http://rokevibe.epizy.com/88147588971.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/pozalusika.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/disputing_collections_on_your_credit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/java_runtime_for_minecraft_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_off0000df73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF73 5528 bytes
SHA-256: 77b0787c9ac1597d638bef176370a2adc8730e4414417bde3e5d8810c09d35c6
font_01_sfnt_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 10444 bytes
SHA-256: 719131afffb577af1d94aa7fca313efd36409ccb1460b4c9763fe0559dc17e17

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