Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe32af24007ad7e…

MALICIOUS

PDF

89.7 KB Created: 2021-03-19 10:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d5364f5368467437c3bcd7b0554acbd1 SHA-1: b16b78ea272cf5392e4bd9aeb5d61a769e40d961 SHA-256: dfe32af24007ad7eb0b7133dacb24a8c0717bee406275b6fa02814c1f5f7e276
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to a suspicious domain, jumiwimov.ru, which is likely used to host a phishing page or download a secondary payload. The document body, though partially corrupted, suggests a lure related to a crossword answer.

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://jumiwimov.ru/123?utm_term=outline+plan+for+approval+crossword+answer PDF link annotation
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/4696768.pdfIn PDF document text
    • http://verezitabel.66ghz.com/5879937329.pdfIn PDF document text
    • http://kevesojesofun.22web.org/transport_company_profile_sample.pdfIn PDF document text
    • https://rolugoxeve.weebly.com/uploads/1/3/1/3/131380951/1ca6911508.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/697a16a2-ca6e-4695-9ecc-82267d511081/codigo_ascii_acento_mayusculas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6d27d3f-8fbe-4cfb-a19b-473f486483c1/nagusukazusujitube.pdfIn PDF document text
    • http://vuwepimu.epizy.com/d_p_g_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/71898170120.pdfIn PDF document text
    • http://mimenevav.epizy.com/prospect_lefferts_gardens_historic_district_designation_report.pdfIn PDF document text
    • http://lupibewexuzu.rf.gd/87023140893.pdfIn PDF document text
    • http://poxizigifami.epizy.com/piriformis_muscle_compresses_the_sciatic_nerve.pdfIn PDF document text
    • http://xelaful.epizy.com/sabakilobekog.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/cheat_india_all_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/97005281413.pdfIn PDF document text
    • http://ximitexus.epizy.com/what_reading_level_is_flat_stanley_at_bat.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/radipunatineg.pdfIn PDF document text
    • http://xirotowukutizu.epizy.com/73148439346.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/achtergrondmuziek_film_en.pdfIn PDF document text
    • http://punumakiwibase.rf.gd/florence_scovel_shinn_das_lebensspiel_und_seine_regeln_youtube.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_off000108ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EE 5328 bytes
SHA-256: 656fe7a78bbbcb1515631b5221523459e0a26a223907baece17530ebb5a045ba
font_01_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 11460 bytes
SHA-256: 06b5f2e39a9a778cf771b996979ccd885f2442d6c3092443ef644fc794bd1dc5
font_02_sfnt_off00014204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14204 16488 bytes
SHA-256: 6aca158f9912cad2e5614e51322c5a84bab78288a6a6ac799975bf40e482bca0

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