Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bb8686aab340cd…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 18:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b213c7945274a512a45e077fd72684a SHA-1: b82521173efc14ff39ab8f75eea29049f632071f SHA-256: 45bb8686aab340cda5a1f7878e50c5cc5d460dd06ffc915b20d7ba1e5d031136
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://queure.ru/uplcv?utm_term=can+i+run+android+apps+on+my+surface+pro PDF link annotation
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed61e4df05---37598608330.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/patatatip.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/26113038223.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b825a2a9---58964485871.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/lagezitafubetodosigare.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/zitewabedawejikerelub.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/52462702984.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/11410151348.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/86413851269.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/kideledaladorevuxigeli.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/51159772921.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1591583090613372d562ae2.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/92249307292.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/31033987656.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/45548556318.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/19595282172.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/60827548543.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/62101697741.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/15956988319.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/18648525627.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/bamoxudavowosutupamuxasul.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/1716576644.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_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 10880 bytes
SHA-256: 73e5082fbbd2108c744449b822678195cfb9f5946d84729bf3aae72fc21fab0c
font_02_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 17972 bytes
SHA-256: 46bce8683a0b723947e3f4f7588111866feedee6d36a4592462dc80eb9318be8

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