Malicious PDF — malware analysis report

Static analysis result for SHA-256 3777a831236f01f5…

MALICIOUS

PDF

89.0 KB Created: 2021-09-09 23:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 973b6ee6b82fc585a50a960a952e04fd SHA-1: 5b3c38240a764a80f5e5992bff494a70abf003a1 SHA-256: 3777a831236f01f5e8a9a14cc6b0e1b7653eb114bcc4c2c4b4bdf98323c87c16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous distinct hosts and disposable domains used to host PDF files. The presence of embedded URLs and the overall structure suggest a phishing or scam attempt, likely to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coevent.ru/upload/files/62728440807.pdf In PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/veperikuliserejetosikot.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/rufubarupak.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/30223799037.pdfIn PDF document text
    • http://klinok-saintp.ru/files/82314650108.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/85856392551.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/88865023203.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/givamor.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/beninirazo.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/24657605260.pdfIn PDF document text
    • https://eventaipei.com/upload/files/fofet.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/lileguwopopotilekuxewa.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/vowovidowelufagutudomak.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/59904281220.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f88cdf67e---98725150430.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/fopibibin.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0358b8ec---gerapobom.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/xojanaru.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/numoko.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/5031723135.pdfIn PDF document text
    • http://risme.vn/files/52262007312.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/govodematifolapipusotejof.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/34009178319.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/parulav.pdfIn PDF document text
    • http://badgerhillfarm.uk/detevoxonugapafipek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=root+galaxy+tab+s3+android+9PDF 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_off0000efe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FB 11032 bytes
SHA-256: 70f9122c60503860df2c019a13f495ba7b9b6499df007a099c6dce8d8b881615
font_02_sfnt_off000121a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A8 19924 bytes
SHA-256: be3d2ced62256f821629d292499395dd99c40b87c048aae2b2ac8edfcbf2d208