Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a195e9f5f5c8e1…

MALICIOUS

PDF

71.3 KB Created: 2021-09-30 14:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78a801fb9bd0f335121aa8ef7e6a7ddc SHA-1: d60c83624b91c4f55e7c2b1e978011490284fca5 SHA-256: 97a195e9f5f5c8e17db6a7d546c9acb2c4eeac727b7e209564c4c07bd209b5fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with many pointing to suspicious domains and a high density of links per host, indicative of a link farm. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of a link farm suggests the primary goal is to redirect users to potentially malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hargagila.com/uploads/image/files/53487004330.pdf In PDF document text
    • https://portofcrotone.com/dati/upload/file/86270638104.pdfIn PDF document text
    • http://ore-processing.ru/d/files/tazotifonas.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/73456163113.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/56623333139.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/72072526000.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/7325462519.pdfIn PDF document text
    • http://agavietnam.com/img/files/69679011809.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613f18668169e---mudubitimet.pdfIn PDF document text
    • http://balone.net/_upload/file///gukusuviralegovewu.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/33582024327.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/pikadugugivumexonuwudofur.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/razugelawiw.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/5517612374.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/39410814018.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/7819137623.pdfIn PDF document text
    • http://dsagco.com/Upload/file/37547879202.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161539354ee70e---ruzowamu.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210911011026-716977187.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148932cee2ce---27932879771.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/5811506239.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-1/20210901183245661353.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/jitavizikejupikizopifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=orient+led+tv+price+in+pakistan+32+inchPDF 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_off0000b413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB413 16252 bytes
SHA-256: 86b6eed0c1967dd225e2ec3341c3f144122743e071deead58685c8154d833091
font_01_sfnt_off0000dd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 10964 bytes
SHA-256: 4274e55949ebc3901eea770190e3aba286621794d907a0e27334ead44e7e5ffc