Malicious PDF — malware analysis report

Static analysis result for SHA-256 23715bedd94634f3…

MALICIOUS

PDF

85.7 KB Created: 2021-04-05 15:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9be5ec346042d62c0cdde323fca2729 SHA-1: 08f9dfea25935eaa723e160a7431c4e305f0b7fb SHA-256: 23715bedd94634f32b8721ef659afb885b096c3017aa05defa4b2912e7398550
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 numerous embedded URLs, with the primary one being 'https://dafemum.ru/award?keyword=conjugaison+verbe+etre+et+avoir+pdf', suggesting a lure related to French verb conjugations to entice users to click. The presence of multiple disposable hosting links further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/award?keyword=conjugaison+verbe+etre+et+avoir+pdf
    • http://puvepum.getenjoyment.net/fanufinoj.pdf
    • https://tajifajedu.weebly.com/uploads/1/3/1/6/131637014/df50697d422c155.pdf
    • https://poxosopetijonaj.weebly.com/uploads/1/3/1/4/131453527/3752476.pdf
    • http://beririka.scienceontheweb.net/62967331391.pdf
    • http://smcjd.com/jimuzaraxarisenokemedupuk2heu.pdf
    • https://rezodipegizosif.weebly.com/uploads/1/3/1/6/131606434/buteboxaluwoposojud.pdf
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/bbfe7.pdf
    • http://ibkreactiva2020.com/nonajokusimomamozezexowuop2m4.pdf
    • http://pmaider.com/dozowutudikabvnwjz.pdf
    • http://lorenbayi.com/highway_traffic_racer_3d_need_for_racingdyw1h.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rogomore.myartsonline.com/aprende_a_dibujar_comic_download.pdf
    • https://uploads.strikinglycdn.com/files/54d23093-7850-4dd2-ae41-2712e170a0f6/menebusonalut.pdf
    • http://najijojovigom.myartsonline.com/clinical_oral_implants_research.pdf
    • https://uploads.strikinglycdn.com/files/37041b68-52e6-4d55-868a-ab73c32bdc73/19100769558.pdf
    • https://uploads.strikinglycdn.com/files/6a15f07d-bb7f-4aed-b933-a8339d708822/21040265010.pdf
    • https://s3.amazonaws.com/tosego/35101991868.pdf
    • https://s3.amazonaws.com/kimone/swann_security_camera_nvr-8580_manual.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee01.bin
e92a6e1c496ee691665bf65c92b140dffcd5ba24d202bfd05a5662dc2163f959
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 5356 bytes
font_01_sfnt_off00010047.bin
8770a9d16f6ec8ed1e04f7f31595c1fd3834ff76ff6f55291086ab87d6d749e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10047 2268 bytes
font_02_sfnt_off00010a59.bin
e75c98553b2db41d187b2d10895322955d6e0490b8024137abc245fea61d9bc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 12376 bytes
font_03_sfnt_off0001319a.bin
ce68f844d1ed93562a4d47e10b48228bcf4869bf5a8f0d05780cf70a467b218c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1319A 16256 bytes