Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f2b66b3f983c7e8…

MALICIOUS

PDF

74.6 KB Created: 2021-02-16 19:26:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bd1c08e01290aa57819eede85480d4fc SHA-1: fa0fb5bdd6b78a6009a266301ff51c4b810275db SHA-256: 9f2b66b3f983c7e85fbfe3a6ee0bde1cd8607541986f60d5f588ba346686a5f5
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, indicating a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns are indicative of a phishing lure, potentially leading to a second-stage download.

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://baarspo.ru/123?utm_term=what+is+the+synonym+of+common+sense PDF link annotation
    • http://lovefoxesi.iblogger.org/4963826997.pdfIn PDF document text
    • http://waliwijufe.iblogger.org/firefox_increase_limit.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/jg3gija/cinema_box_ios_13.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/hbhcheW/download_gta_liberty_city_stories_mod_cleo_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/ejgiav4/86154353666.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/iWOxehf/airport_city_hack_no_survey.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/BYRyifi/wojavomesivoposarusisod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karimelu.rf.gd/healthy_eating_guidelines_for_schools.pdfIn PDF document text
    • http://jezosimo.epizy.com/baxojabanatewagako.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/bpsc_ae_admit_card.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/third_grade_grammar_worksheets.pdfIn PDF document text
    • http://poxoner.rf.gd/freeman_guerrilla_warfare_guide_2019.pdfIn PDF document text
    • http://tekuxumavipu.epizy.com/crater_lake_map.pdfIn PDF document text
    • http://tixelupaninaber.rf.gd/92485115361.pdfIn PDF document text
    • http://xovanixavujanu.epizy.com/the_informer_movie_trailer_2019.pdfIn PDF document text
    • http://resisimokopi.epizy.com/suvox.pdfIn PDF document text
    • http://xikebivulusures.rf.gd/97357002037.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 5108 bytes
SHA-256: 1f224365d75dc3a937650f993d3dd65bf9668965b98f312fdcb40fcbcbda4093
font_01_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 10640 bytes
SHA-256: 1e12d0f312f86da9068ea62d499054859e9ff8dca9ed5c307f802333545606f2
font_02_sfnt_off00010788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10788 16316 bytes
SHA-256: 71012109155a9b3f3db5e6834c7b8801c285084f12c4c29c13c651ef04528056

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