Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7ac2b9b638f272…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 15:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b3fb11674b5774089cbda05e709d300a SHA-1: 060e66d291538c24be0dc7b3b41f28d04e47c772 SHA-256: ea7ac2b9b638f272367194e67093076b48a62e9594ac8c544a4f58423ca333ec
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 a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://drafthe.ru/uplcv?utm_term=how+to+fix+android+screen+freeze PDF link annotation
    • http://quranday.org/userfiles/file/dusabix.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/77958075515.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/falajuwikiw.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/40281605520.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/juwov.pdfIn PDF document text
    • http://friulanapanini.com/images/file/movuvoxobalujipaf.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109190903426434.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/21231385028.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/verolivamufipo.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/goxajilodavesodapawiwemed.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/35196510335.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/614403057.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f78db0bae2---12016474630.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/69334423949.pdfIn PDF document text
    • http://carbonelite.ru/file/71389223109.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/zebavokewe.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137431bb93fe---84166197782.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/92574248696.pdfIn PDF document text
    • http://candientuvibra.com/images/file/kuxibiriperivikozozor.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/29186342083.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/popimibadinirimisalesug.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/73149726387.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_off0000ac21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC433 16096 bytes
SHA-256: 304353cfbde4caf4989846ac456736a1c04371ab2b71a21fc57a5404bc14fe03
font_02_sfnt_off0000ed35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 10660 bytes
SHA-256: 7503dbecd8671ac7b1ac24366bc2f5f09003e617ca384b0e837a4d0231a0de5f

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