Malicious PDF — malware analysis report

Static analysis result for SHA-256 8885604e1329af13…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 01:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5ae1f040c0a13a160d7b2fbb308c2c8c SHA-1: 36a06fe591d4f4e0ae2550b4868d94dfbcf1a002 SHA-256: 8885604e1329af13ea040a54e367adca7016890d0e8029c721d9f925f862c594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs, including one pointing to 'infrive.ru', suggesting a phishing or malware distribution lure. The PDF structure and embedded links indicate it's designed to redirect users to potentially harmful websites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=sonic+4+episode+1+all+chaos+emeralds+apk PDF link annotation
    • http://www.greenfield-sustainability.com/images/files/masevefa.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/68516745591.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/nalafokoxobara.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/75077077698.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/gajiralifaxuzomoburo.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/72576337063.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/15943738731.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b2839678---79128409902.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/gopomexirobuwewedu.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/14692047289.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/puxisemugasam.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210903082634.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/sowonakojozuxomatelegu.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/43050521050.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/91157561637.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/96542036774.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/rosikizu.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/xativisogule.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/tawavuzikunupozedepimebot.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210917_27B1D7490B34EA95.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/28282337609.pdfIn PDF document text
    • https://buka.ru/sadm_files/91189635152.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FA 16132 bytes
SHA-256: 99e9b17fd4aa19c70c65da9ff937c3ffa84aae58cb9629ce583d59754ce6f5f6
font_01_sfnt_off0000df50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF50 10976 bytes
SHA-256: 204c53fdf7fe35b6f4f00ea1fc6cc0c4534c68e3071e133516fe45ffb04bb112
font_02_sfnt_off0000f89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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