Malicious PDF — malware analysis report

Static analysis result for SHA-256 07640da91affea8a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-11 17:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61ab8e31edf70998132cec685a0f847f SHA-1: faa489cedb17675aeefe5eacd8359e5f648b38af SHA-256: 07640da91affea8ab62e93370653560a709718788a485ea490eafcf3d3064f5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a strong intent to redirect users to potentially harmful websites. The PDF structure and embedded content suggest it's part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=old+android+icon+pack PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9bea861c---timubalakasidezav.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/nozavavokuxazise.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/19811644066.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210911022028.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/24961526282.pdfIn PDF document text
    • http://dogable.de/userfiles/file/dumuresegukabit.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/pakosorititasamoluwu.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/javifuvuzinodaviboji.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/rexuk.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/84996291133.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/48734241625.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/maruxilaloxujaxowadofip.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/45470799469.pdfIn PDF document text
    • http://darec.sk/files/files/rufuzabugafu.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/dumijukewawomudolojo.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/jixuwato.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/83146414040.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/70580920244.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/savegurepepiwixamuwox.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/20694651348.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/vuditixefome.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/63083775363.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_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 18868 bytes
SHA-256: 9a53cd3c15c5f3d9f0024c58645deee59978eb3b78caf2a562aaa50ce97c9c3d
font_01_sfnt_off0001174c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 10224 bytes
SHA-256: c685fd0a5243ff0ef8ae07c306b4da9c5f430c5eadb8a2d600af14a8a4482801

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