Malicious PDF — malware analysis report

Static analysis result for SHA-256 8905e146804f5b16…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 07:07:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73ebd53dd670c80b1e6092245696b983 SHA-1: 98fbc532eb66a2ef2c233bdc5a7dbf6c67a4c3aa SHA-256: 8905e146804f5b16831fdc41589331ca16709ccd24e29b935e02e3189a46a890
166 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates it functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially disposable domains. The presence of 'cmd.com/data/files/' in the document text suggests an attempt to execute commands or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/54543850dc7e31a7dcdebf4f6f987c84/94216362041.pdf In PDF document text
    • http://skene.es/userfiles/file/56478300095.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/goxezirelitu.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090201115573499.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/26289427640.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/4037974597.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/84647204702.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16134f36fab02e---zutejexamaduwavam.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/90658644951.pdfIn PDF document text
    • http://qdcmd.com/data/files/buxotifom.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/xedij.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/pefujonadimego.pdfIn macro / runtime command snippet
    • http://silesiacapital.eu/data/file/gevibegejego.pdfIn macro / runtime command snippet
    • http://ccsl.asia/files/simisugezijakogu.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/91204939282.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/komosobiduzasuta.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/34775704259.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/jojenekafozitid.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/gitegodozuranujubikuwu.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/jerelu.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/83482326309.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/85018494507.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/bajelate.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/1107658889.pdfIn PDF document text
    • http://biondiairsystem.it/uIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=positive+adjectives+that+start+with+o+to+describe+a+personPDF 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_off0000c9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 16408 bytes
SHA-256: f54d0ee83fe355d15e6757558a92b384fdae46ab66c6abc7d8c0485c0e1a3aee
font_01_sfnt_off0000f33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 10988 bytes
SHA-256: 4a92fac9534e1fa2170a92985eacad8794bfa42fdc359e052f8fe021111cb37a