Malicious PDF — malware analysis report

Static analysis result for SHA-256 09cf1778a42c264d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-28 21:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 66ac464c49fe24d2485c7a8ce69b8be1 SHA-1: 7f8536ea512d1104948ed7c5f81a798c347c0fd2 SHA-256: 09cf1778a42c264d354cda654814a11bb6f740b00e4333419e261ffcc658f272
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The PDF's structure and the presence of many distinct hosts suggest an attempt to obscure the ultimate destination or distribute various malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://reazfarah.com/ckfinder/userfiles/files/81968849972.pdf In PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/59859108418.pdfIn PDF document text
    • http://npas.ru/pic/file/4578163418.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/82586971841.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109081746389374.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/mesawurojegexitilema.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/54245955078.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/9478583083.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/68899610029.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/turepido.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/gomexekesamimop.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d664a69f2---37534412168.pdfIn PDF document text
    • http://hueide.com/upload/files/42603476373.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/paved.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/99428390868.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/bukud.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/50405427333.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1630625588.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///winejeguvev.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109280754334879.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/13983170954.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/22238153374.pdfIn PDF document text
    • https://banghenails.com/upload/file/kipiwubawusopofuwej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hobbs+and+shaw+full+movie+in+tamilPDF link annotation
    • 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_off0000b70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF24 10900 bytes
SHA-256: f8c620a83601b23217a335d539f69519028088edb91cde51ea73bf9e59f3fc02
font_02_sfnt_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 19560 bytes
SHA-256: cd9a25f1d2295dd0499157b8a13430850b88b95c66583e1a10142b7dbde6207f