Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbd2ea0ed1ea137…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 04:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d9ebaa0e6269b1e6017ebdd75aa08559 SHA-1: c882392768e3feddeb386c0cf42accabb6b3f4c1 SHA-256: 3fbd2ea0ed1ea137a3daff4826e8b84d736e7cc547fa99f897909b2750356586
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to other PDF files hosted on various domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, which is common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.andreapondika.cz/file/kumosodazupimupuwasavij.pdf In PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/feponavomusogazatife.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/dunulizigixer.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/72445641906.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/50168392117.pdfIn PDF document text
    • https://razredna-nastava.net/files/besovurubuf.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/noxujofaxawotezoli.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/68808278226.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109162018433885.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/wogifixakibunevavo.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zororojapurezabid.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/xexuxigelijuwanuwamapa.pdfIn PDF document text
    • https://lasanisports.com/files/fadoki.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/27713296861429af16cd12.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/86802020666.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/maxagebanizo.pdfIn PDF document text
    • https://produse-zilan.ro/files/fedefudogebigosekisas.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d60528e517794d4175b70aaf5d71f242/86404544813.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/42474476698.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091309552080554.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/gupaserujudawakuwidevijim.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/658428f50a28fc251c1812d30f05f6ff/19594502378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=traffic+racer+for+pc+downloadPDF 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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 19276 bytes
SHA-256: bfcebc259a832306b8e472cd49dc75ccf474f599f9eebdc6171efc6c220a43f5
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10396 bytes
SHA-256: 5bbbbe308ce656ac2cf770ccf79aa0d62233b6db4907a04266a89fe4ab0e1012
font_02_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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