Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed64d8d677f42e02…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 15:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 343aa266a22edf664d24d1ecdbcc3907 SHA-1: b3053075ca6e57dc0574802b8da48f1058cb20c2 SHA-256: ed64d8d677f42e023a5f60cb27874337524bdb29e92b936dec9cccfc7970a554
174 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, including a high number of embedded links and a 'download button' heuristic. The 'Password-protected archive handoff' heuristic strongly suggests the document is designed to trick the user into believing they need to decrypt a subsequent file, a common tactic for evading gateway security. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://manenshop.com/upload/files/62708163358.pdf In PDF document text
    • http://unsersohn.ch/images/file/25505335352.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/zifozelilonimowopag.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e6a5e317693384a46110ebd7cd2bdf26/vovemifuxeje.pdfIn PDF document text
    • http://boki.hu/editor_up/6811202910.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/87136543469.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/12054159855.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/58970632383.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161335be7da8d5---lafewisi.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/jepumefexe.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38647338765.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/67341861671.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/gotubukifuxadanewogirija.pdfIn PDF document text
    • http://videlec.be/ressource/file/64551105726.pdfIn PDF document text
    • https://novitas.ro/files/62474123408.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/beditidom.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/sawulevafewes.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/ziwuvagibig.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/xetemipaxujug.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/22708130662.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/36840685772.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/79066262415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=netstumbler+android+apkPDF 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_off0000d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD203 10864 bytes
SHA-256: 582cb3e7319f593bca97d0a67cfdb95d245353a0883f56d6bde47687e92c713c
font_01_sfnt_off0000ead9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EB 18144 bytes
SHA-256: 04dd0470a32b84c83020f88e69c42f6dacdce351aef60e874980a9fc8c017632