Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed652b12de466be7…

MALICIOUS

PDF

72.8 KB Created: 2021-03-19 13:46:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fd2171a295a374d606df594798aa2dfb SHA-1: 1a62bbe133dd5208d5eaa41d8a9c01da4aebd9fd SHA-256: ed652b12de466be73f30021008162cfa85a7dec244ae98629b0cda24b0a25874
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/123?utm_term=types+of+probability+distribution+in+statistics+pdf PDF link annotation
    • https://vozapevozatoka.weebly.com/uploads/1/3/4/0/134097066/679949.pdfIn PDF document text
    • http://sifegip.iblogger.org/redob.pdfIn PDF document text
    • http://rodsfish.club/old_time_country_gospel_music_videos8dv1r.pdfIn PDF document text
    • http://sozisogu.iblogger.org/lomekavuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481056/normal_60430f78cb613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497110/normal_6013a576716f0.pdfIn PDF document text
    • http://petersikdar.com/how_to_replace_a_badger_insinkeratora2hjg.pdfIn PDF document text
    • http://bidizujimon.getenjoyment.net/can_i_learn_muay_thai_at_home.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_5fdb5a86e3fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380705/normal_5fe8c79a7c6a4.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/45220865709.pdfIn PDF document text
    • http://edapog.online/canada_reporter_quality_control_agent_review46ih4.pdfIn PDF document text
    • http://govuxojikasumot.scienceontheweb.net/putixutu.pdfIn PDF document text
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/roduvimuvabeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gadabejevetel.epizy.com/10358886260.pdfIn PDF document text
    • http://ditajizuru.rf.gd/karcher_k7_85_repair_manual.pdfIn PDF document text
    • http://zutadefado.epizy.com/linkedin_android_app_settings.pdfIn PDF document text
    • http://sizuzupapefapo.epizy.com/73159717556.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/64096295283.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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 5340 bytes
SHA-256: 250919f90262dd66e0b0bb6d8f4914fcb495a4db4a7cf3064e2a26a2a56ffee7
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 11836 bytes
SHA-256: b3598a82e13bb5b46c7dd1f3a09f0208c5bf8b8b3f22a37d160cafd37195adc7

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