Malicious PDF — malware analysis report

Static analysis result for SHA-256 db35481721d9defa…

MALICIOUS

PDF

95.9 KB Created: 2021-04-06 20:41:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4e7840b6ac63d5d452c463584e0d072d SHA-1: 9bfcdd50824651084d03973d7540f9039945c39f SHA-256: db35481721d9defa6d1c9ace60dd84c24ee71d94be9e25e23aa37e3425168bc5
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/award?keyword=cours+pc+1+bac+international+maroc+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410985/normal_5fd99d97bfcbf.pdfIn PDF document text
    • https://fokurojisek.weebly.com/uploads/1/3/1/4/131438639/a5260624a.pdfIn PDF document text
    • http://zakunofukar.iblogger.org/lotij.pdfIn PDF document text
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/2493256.pdfIn PDF document text
    • https://sejabekozifox.weebly.com/uploads/1/3/4/2/134266090/430189.pdfIn PDF document text
    • http://jonezuno.22web.org/buy_celluloid_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366980/normal_60609fb8014f9.pdfIn PDF document text
    • https://nexitikobimefa.weebly.com/uploads/1/3/0/7/130776699/mavafirejekudakad.pdfIn PDF document text
    • https://dujuwugad.weebly.com/uploads/1/3/4/7/134721680/5be5d0eaa52c155.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/bomberman_switch_play.pdfIn PDF document text
    • http://gateguka.epizy.com/it_project_manager_resume_sample.pdfIn PDF document text
    • http://pemulotik.epizy.com/komixisavizido.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/gesapowifafekab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eecae9d8-6a5b-441e-8f5a-80aa4da9095e/waxunuvubuwuvikekitekofar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2effcdc-152a-43f3-ad19-31457f13847b/durabiso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665bb2da-8600-42e6-8c4e-f1f5956a9923/vuwirevikogarolamisamo.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/what_car_seats_are_compatible_with_baby_trend_sit_n_stand_double_stroller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ef2d1e-ae7a-4421-8f5d-2928863a1ee7/tagekik.pdfIn PDF document text
    • http://zerakunutage.epizy.com/vonuwofaw.pdfIn PDF document text
    • http://wazinupizut.epizy.com/potulawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8454cadb-ec16-43a4-bd11-0af1000a3301/what_i_am_that_i_am_means.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/sitebugamanugobunik.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013eeb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13EEB 27680 bytes
SHA-256: 89f3ffe88b2c04272484960d35a5033534069b488e5f4da163a06947a1dd703d
font_00_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 5400 bytes
SHA-256: efbf63b743ca24df08f2f89c74524f8131e57e8f7318dd5253c171aef8294aec
font_01_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 13264 bytes
SHA-256: 4bb546471d712a82458679bccc243d02009a04335debcdf39e6417f841dd023d