Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1f2dd7a92c32c7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-27 15:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a29c600b8d8f2d7b882c4b4450c35688 SHA-1: 1ce1e1eae8b200012e01d061fedf19022ba6f3e1 SHA-256: 0c1f2dd7a92c32c7a7ad99be4043d0fbd178b6abbea926214d4eb905b6be691e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing phishing content or malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mm59vpatj3ns8ok8tr0thscn5m/60293157074.pdf In PDF document text
    • http://kleinschadenexperte.com/userfiles/file/xokejuzetinafokiwaf.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/4987643645.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/63228158141.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/7709100886.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/vopilefu.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/3130371531.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/93914891606.pdfIn PDF document text
    • http://danbikoreansj.com/uploads/files/nibarisinefimedazuriniwe.pdfIn PDF document text
    • https://cncunse.com/d/files/97159185671.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/roralazikotemajetoded.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/nasupop.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614989df369c7.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/85883501835.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/wofujibagafo.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/85474466129.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/33337144512.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/27086393966.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/zivupuxexivisalejelebo.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/buranilawisi.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6135426b493f0.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/kewubenisivofozazokesir.pdfIn PDF document text
    • https://bawauang.com/contents/files/76853641847.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/60655171781.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/54347614500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=hashiriya+drifter+money+hackPDF 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_off0000b56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56D 10892 bytes
SHA-256: fdfee61e07268a92c38216e977ffe1a496f6ff44ebebe34782fac77234100838
font_01_sfnt_off0000ce76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 16992 bytes
SHA-256: 76fa5b9a00d21aed513d7aea57423ad8b1195d4d3f7f45ea82472d129f14eb19