Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbaff9e3bd6a1496…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 08:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ab5fa7d47fef57389ff5c5acbb138c4 SHA-1: 52df60926f589cffc9a2dc9386185a93dcffb3a9 SHA-256: bbaff9e3bd6a1496eef0f264713f4889c94edfe0add71fc616aa2aff1e0e0af5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://oniceh.ru/uplcv?utm_term=alice+in+wonderland+full+story+pdf PDF link annotation
    • http://www.ezmoving.com/file/67920234949.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/xezubixiw.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/sezugajif.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/16694012503.pdfIn PDF document text
    • http://velisend.ru/photos/file/mapanefoviwajideginomug.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/woninedonodo.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/63580447171.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/5146347964.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614628129add5---fotobitejiledagakibezof.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/29344650187.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/volofota.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/85787430283.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/gurebiladit.pdfIn PDF document text
    • http://bienbao.org/uploads/files/mewesupemenebazitizogib.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/37097663546.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/36690772399.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210903070808.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/nosepulejedes.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/88763537520.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/8830117112.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/74287555519.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3ef27a93e029befbca92b0b3d16cc91f/xukuranelolovuforonalu.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/judomaxazamivanekizuvi.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/8253995975.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/45180032174.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/34249840118.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_off0000b1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 10892 bytes
SHA-256: 6d787822a645f51f451ace61b3e3ed40022007f4bb71122ca65624eb09c4d0c9
font_02_sfnt_off0000e339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 15416 bytes
SHA-256: 82170a33069fbb4b5ac703d9dc30eb161d72c79830c719155b2d7bcde5ff5715