Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0d50ae556bc0ca…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 00:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35f78f73e83c462122435eb63fa79101 SHA-1: 56cd1d78011fe34c202f61b00c8fb995e9775f5c SHA-256: 7d0d50ae556bc0cabe6d53082376f3f48fa47c1c6d788ffa04201fbcf1c9da97
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains and employing UTM parameters, suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=wallpaper+naruto+android PDF link annotation
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/49074900850.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/31661702705.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/82863199782.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/zarokewapu.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/fodozazokaxepu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce42658c7---96208073318.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/rasumafefesoretikubunojib.pdfIn PDF document text
    • https://makenie.com/upload/files/tozojavo.pdfIn PDF document text
    • http://fnathservices.com/upload/file/bivosaxagalumejagakupaxib.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/tekosaneru.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614165592b4b9---9670554755.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/wejutevulizozelobuweni.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/98280816978.pdfIn PDF document text
    • http://htwy.com/upload/file/67572891803.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/wodapudofozakemisugojenut.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/67607623317.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/babazetofovabukusolukowag.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/14301798126.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/71735089864.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/9351615652.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/tuzegorotutonekila.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/fofofolab.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/32623674644.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/48611106398.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_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 17612 bytes
SHA-256: e4205b58e58d0db7fabab2cd4dec8719796ec8d947365b56f14956f4ed161404
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142C 10312 bytes
SHA-256: 7e19780f6dc9feb9526859e1b69275a24719d0d7d111656da9e1cc9975228965