Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1c64af7880c334…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 23:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7faeba65ea1e8965cceaaac0fbf8251c SHA-1: 6e8ebccae04064102c4f4f7672b837eb0d8ea503 SHA-256: ca1c64af7880c3345d42b0ff1b38ab520ae3bf3fb7a0251b5b2f466a71ae8732
126 Risk Score

Malware Insights

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

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 are part of a link farm hosted on disposable domains, indicating an attempt to direct users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=how+to+stop+ads+on+redmi+note+9+pro PDF link annotation
    • http://kmbb.at/userfiles/file/97764766834.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/86368534123.pdfIn PDF document text
    • http://oilspecchem.com/files/nemusonu.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/mujutiferosisuxiredituza.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/14510406363.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/59605563261.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/fotiritulidizuvumifonovi.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/69323356184.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e74b80ad4---28291039953.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/11175164121.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/65014484649.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/17850205604.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/27696606244.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-2/20210902053050104697.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/weduraforanepipedi.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/bapijitipudepujup.pdfIn PDF document text
    • http://feminella.ro/upload/fck/2081642186.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/kepureke.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614369ff60a26---segamivok.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/jijuxusegurudop.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_off0000b08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08C 10752 bytes
SHA-256: 439464995c0c67387d5a120d1c26ebaea42f0e26f081ace227628ae25014397f
font_01_sfnt_off0000c952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 17432 bytes
SHA-256: ee04ff52e5a2cc370b11c7c84aab487323b9468cd7302fe337799ff287bd3045

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