Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68d5148908c424e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 10:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60ac59900041b1dba5d2ea6ea6e6d94f SHA-1: 2f1ecff940241f5129e6e025badcd9144969400b SHA-256: c68d5148908c424e90ffdcaaf364d250f1d51c1ec12055a44c663987f3ef8b8d
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to the document acting as a link farm on disposable hosting, with numerous distinct hosts and a high number of links. This suggests the primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gregoryshow.ru/files/file/24410351868.pdf In PDF document text
    • http://suaups.net/userfiles/file/66219402331.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/13858382385.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/worepeke.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/rolagotinenubezapuzeb.pdfIn PDF document text
    • http://schturman.ru/files/files/gabutev.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613589bfe17dc---43961379137.pdfIn PDF document text
    • https://papiratisk.cz/soubory/gogaruwobaketemegupiwa.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/33147265528.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/51826567659.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/83906646964.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613565a18daa1---98713260623.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///38474798202.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/52428991579.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zizerutelajije.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/58637612405.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/tojufavujepexeriz.pdfIn PDF document text
    • http://a-pluset.com/userfiles/dixitebemi.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/bupudivavuv.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/noxewinowofajusevoselev.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/vexipinu.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///16750272974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=airplane+mode+android+programmaticallyPDF 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_off0000e458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 18364 bytes
SHA-256: 7b7fa908bfac556c1237d1a1fd339d9e420501fc7c09e85747ca26b969ecbbb3
font_01_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 10784 bytes
SHA-256: e68cc999f281e252403efdb0d755d3a9c9e9395ddfdbe9452441ea51bb6d00d6

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