Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8f53ac03e157aa…

MALICIOUS

PDF

79.6 KB Created: 2021-04-21 18:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d81ae1ac09bcccd4dc5135b93cdc3ba5 SHA-1: b89076e8bf105fa6aaa576178cf6a54ca22745f5 SHA-256: 3a8f53ac03e157aa797c0432ee3c6d951b5ed787220d87273896a43050b25474
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 0.9997

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://crophysi.ru/strik?utm_term=descartes+meditation+4+pdf PDF link annotation
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/wujifofotupixupijaw.pdfIn PDF document text
    • http://nigemutekilum.mypressonline.com/free_printable_blank_bingo_cards_for_teachers.pdfIn PDF document text
    • http://figosagimetiki.iblogger.org/87514454954.pdfIn PDF document text
    • http://conicppjry.bid/jenijexebisoxa07xhr.pdfIn PDF document text
    • http://pearhaidhr.fun/wazupisukamagutuvihud7n.pdfIn PDF document text
    • http://luvatok.66ghz.com/avalon_hill_squad_leader_rules.pdfIn PDF document text
    • https://lepenenaxagonu.weebly.com/uploads/1/3/0/7/130739126/dimasajonubaz_zodakuwilegaz_wufov.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://sovuradema.medianewsonline.com/vededawonax.pdfIn PDF document text
    • http://ribipozosotol.iblogger.org/xoxunisarepurolaxisesowo.pdfIn PDF document text
    • https://fexiganariv.weebly.com/uploads/1/3/0/7/130739648/4aeab7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/866d1111-6ea1-477f-92b6-ccd5222f827a/2016_toyota_camry_xse_v6_0-60.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4a33d28-36c9-45e2-803a-183efdf31e25/what_is_kolcabas_theory_of_comfort.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a3c0516-1e7a-4e49-9025-1a9a6ee48918/list_of_greek_mythological_movies.pdfIn PDF document text
    • http://nudobuz.rf.gd/nikon_d3500__af-p_dx_18-55mm_vr__70-300mm_vr.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/pobejibelorufedarubigewa.pdfIn PDF document text
    • http://relanofog.rf.gd/advantages_and_disadvantages_of_partnership_firm.pdfIn PDF document text
    • http://gotutopaxedirek.epizy.com/geditefurasezadevegepij.pdfIn PDF document text
    • http://nekobegediru.epizy.com/pizzeria_deville_hours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26acd523-1d6b-4aa8-acd2-b0d607b0febe/73451972558.pdfIn PDF document text
    • http://nujafosedoke.epizy.com/bloodlines_2_richelle_mead.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 5356 bytes
SHA-256: 70a73310966e48e72186ce23dffb685b195c8e087322765688132b13346f9ea9
font_01_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 12000 bytes
SHA-256: b840492aedee86742bebbd518c9402c4ff680ca0e04c4127e770d9679cec536b

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