Malicious PDF — malware analysis report

Static analysis result for SHA-256 a685d9377b6042cc…

MALICIOUS

PDF

84.6 KB Created: 2021-03-18 02:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4cc6fcd0a575f6fb2ffeadd8b936810d SHA-1: 8545c3244d4594d3c44645475e846ed0960472c6 SHA-256: a685d9377b6042cc1854a9e50467a5a04aaf10635f27acbc0ecc699938b0d154
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish for information. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/strik?utm_term=onkyo+tx-nr616+receiver+no+sound PDF link annotation
    • http://fijexojor.getenjoyment.net/geronimo_stilton_books_list_with_pictures.pdfIn PDF document text
    • http://keto-menu.online/pepper_iron_man_suithjmus.pdfIn PDF document text
    • http://ijmalan.xyz/toyota_camry_2013_performancekuw9x.pdfIn PDF document text
    • http://mmuuue.space/tiximusarovijubodelodtirkd.pdfIn PDF document text
    • http://wogizejelalod.iblogger.org/lusijunefesisojid.pdfIn PDF document text
    • http://fomoregekamikat.mypressonline.com/calculus_early_transcendentals_3rd_edition.pdfIn PDF document text
    • http://justiciaforjustice.com/are_lg_front_load_washers_reliable9phco.pdfIn PDF document text
    • http://xifutipixa.mywebcommunity.org/vozoboturisigusaguv.pdfIn PDF document text
    • http://xalisuvo.22web.org/canon_eos_software_without_cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasirirufib.rf.gd/occupational_therapy_assistant_job_description_template.pdfIn PDF document text
    • http://laxigazejegoxe.epizy.com/xijazugisav.pdfIn PDF document text
    • http://wozimape.onlinewebshop.net/jurnal_tentang_bronkopneumonia.pdfIn PDF document text
    • http://dibawuleseba.rf.gd/examkrackers_lsat_analytical_reasoning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f34d059-eca7-4b9c-98c5-9e0fc4a8b435/data_structures_and_algorithms_in_java_interview_questions.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/52980435527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0fb398-6d54-44e2-b8d8-8f1adf67a3e5/how_much_do_a_private_investigator_cost.pdfIn PDF document text
    • http://jarawujutuva.epizy.com/zedilojefo.pdfIn PDF document text
    • http://ritumogadoj.onlinewebshop.net/xopugenevisome.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/2_2_cycloaddition_reaction.pdfIn PDF document text
    • http://xidopozisawe.epizy.com/kosawoxunekusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241ebbc7-65f3-44a3-8e1c-dcdc01b7f97e/kojowotudabobukelevofujer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93448c7f-a722-441e-9052-2beccbcd81f2/wuxiwisudekobewigojejevu.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_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 5248 bytes
SHA-256: 850f2ec65847b46074971283f2d20f42b0697a41ce2730223dc4e1df3ff278c9
font_01_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 10756 bytes
SHA-256: 4617d3b901e486a1d37c87b6d4be5eba188d65b76d61123f057f45a3b34273f4

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