Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a5b547bdc0e934…

MALICIOUS

PDF

75.9 KB Created: 2021-03-20 12:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f7078e76343880bf5565696a761cedca SHA-1: 268560d88fdd71004475ea35f8d1fe9605c684a5 SHA-256: 09a5b547bdc0e934ceddc9fc173fce4552a878c40a2b4b4c6589f2819038a3cc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'resalured.ru', which is likely part of the phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

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://resalured.ru/award?keyword=calendario+mensile+novembre+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/fabozesemi/djahhom/r-_type_delta_ost.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/ihjk3yD/missing_link_shreveport_owner.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_3afb0465ffa44b48b1a0ae5fa9965f59.pdf?index=trueIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_09419a49ec0a4a8ab887833f756fceda.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/petikamov/81601712239.pdfIn PDF document text
    • http://jurelofi.epizy.com/picture_reading_comprehension_worksheets_for_kindergarten.pdfIn PDF document text
    • http://lepefefila.epizy.com/fegarufajuxegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c3e3272-2d5a-4ca3-81ca-4674bff17dc4/surevikanugiwu.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/hrzn_earnings_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbbe0471-28c7-4b89-9247-fef412f30397/how_to_get_rid_of_war_horse_rdr2.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/mobusukunetejexuliwubez.pdfIn PDF document text
    • http://limepupotof.epizy.com/history_of_mashed_potatoes.pdfIn PDF document text
    • http://nuvujudidasutem.rf.gd/67663012555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15965392-42de-4ac9-a98e-7bc303daeb9c/air_force_football_uniforms_vs_hawaii.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_b99639f0d5da4646a93238a696d29884.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3037d980-a7d1-4bc6-b33f-8d1dbcee5257/metal_gear_solid_2_substance_ps2_unboxing.pdfIn PDF document text
    • http://letajijagobuma.rf.gd/constant_velocity_particle_model_review_sheet_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD4 5392 bytes
SHA-256: 82505bc3bbc9d786dccc63f922e1c3757985ad9d0ce26acf9f99f872b6fef503
font_01_sfnt_off0000f00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00E 11408 bytes
SHA-256: 749d1453d907ec9b06f6f0d645193c153a05009c4fd3fcef9306372bc6c056dd
font_02_sfnt_off000115b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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