Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0257fc085a4a5ae…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 23:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 90cac807b35db9f90b8b752a3e5e83f1 SHA-1: 42767a47507efc5ff3b5b7e5b25391464558cce7 SHA-256: d0257fc085a4a5ae06ea43632fcd88a02aed789be89dea0798bc0d490e71ea35
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=instagram+profile+anonymous PDF link annotation
    • http://dulichtantai.com/files/uploaded/files/97910310038.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/nejanixiwibaguteninad.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/67298508651.pdfIn PDF document text
    • http://benly-carson.com/product/files/77124767685.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/mesupekexamoxepijumi.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/56602522165.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/tuduvixude.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/getinosiwobuxos.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/1408572174.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161316221d4815---79931487453.pdfIn PDF document text
    • http://altus.pl/userfiles/file/turixumu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/gupekaranimefekafajojupi.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/92732667573.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/73043218984.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/tesefuwivepexovijaw.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/zivakepogujowusa.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/19298341640.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/dinatekib.pdfIn PDF document text
    • https://ms02bet.net/contents/files/10119397725.pdfIn PDF document text
    • http://juha.be/_files/file/79715472384.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/mejufiguvefekuxan.pdfIn PDF document text
    • http://espicycooking.com/files/file///48880104883.pdfIn PDF document text
    • https://areicon.com/images/file/tasexuwu.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210908_045815.pdfIn PDF document text
    • https://forexinc.ca/upload/editor/file/lunimifibexikozifibosumi.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_off0000b9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C5 10868 bytes
SHA-256: 113084e6837f928308458282e7b4749b2ee5590c405815914cb4a82614d0a7a5
font_02_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 15348 bytes
SHA-256: fd77d3ffacf9bdc05dfccf36a18ee84dfeceaafcb72e6499b36898d3d2229fdf

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