Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcb5c1a9c537989…

MALICIOUS

PDF

72.2 KB Created: 2021-03-10 20:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 312b9b53f5d646b15b7b402a16536a32 SHA-1: e628119d99b1873a5ea096fa6eda29b6688d0ac3 SHA-256: efcb5c1a9c5379893427138d70c28423e4d8dbcb5298e0610442ea0add104a7c
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'xezojetit.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'experimental research articles'. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=experimental+research+articles+psychology+pdf
    • https://cdn-cms.f-static.net/uploads/4491152/normal_6046bc2f7e133.pdf
    • https://static.s123-cdn-static.com/uploads/4457876/normal_5fc6d303ac7bf.pdf
    • http://sodalabs.club/good_housekeeper_sewing_machine_manualfrbs7.pdf
    • http://cardioactiveitalia.site/how_to_connect_canon_printer_mg3520ia9uz.pdf
    • http://lnstagramverifiedbadgeservice.com/1847427541mlpb8.pdf
    • http://lupokixez.22web.org/safudemewakipipasazo.pdf
    • http://4d-5d.com/94937491513irnsk.pdf
    • http://usechambre.xyz/excel_vba_find_column_letter4uqy5.pdf
    • http://itslm.fun/noguwenimijegafusofizox6kjfl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tixobanawogoki.epizy.com/navy_dive_school_panama_city_florida.pdf
    • https://uploads.strikinglycdn.com/files/69cc9ded-f2f2-418d-936f-09743a7bd9b0/37482037531.pdf
    • https://uploads.strikinglycdn.com/files/31db7771-d9bd-4e17-a6ba-3200c10d3fd9/how_to_critique_actor_in_a_play.pdf
    • https://uploads.strikinglycdn.com/files/d9cd8f3a-642b-4230-b4db-18349c33466d/vefekadosupuwerageleg.pdf
    • https://uploads.strikinglycdn.com/files/214b1e71-dbcb-49c5-9e3e-e1f8d576afa0/81871943362.pdf
    • https://uploads.strikinglycdn.com/files/b9defe57-da90-4f58-b713-0ef811a2ac5a/79389762007.pdf
    • https://uploads.strikinglycdn.com/files/27c1489f-7193-4aac-b7ea-daf17e2cfa11/excellence_punta_cana_room_photos.pdf
    • https://uploads.strikinglycdn.com/files/ab35d8da-8d74-4641-8342-ffbee712a173/how_to_reset_a_linksys_wifi_extender.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd21.bin
d8baaf6d540e32554231dac2681ff9f2ba40bed94db31e99f37baaca54b9f2d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 5696 bytes
font_01_sfnt_off0000f067.bin
244a08a7238c189d0cd66ee0eb46dcf24a205e670848a00582156fe8c03a690b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF067 10304 bytes