Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4d8b774946ef0ab…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 19:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23314e74b083a0474af45d46a34948d6 SHA-1: 5bee10679518f72e2b3a968b13a6c581145590db SHA-256: e4d8b774946ef0ab40d8b6370ba24dad7cf585ad85f2254db490720dd36defb3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

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://cructi.ru/uplcv?utm_term=fifty+shades+darker+free+download PDF link annotation
    • https://leuphuotcamap.com/uploads/image/files/sikodoxumileja.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/52831135849.pdfIn PDF document text
    • http://clingac.com/d/files/kenedowogubirafupiza.pdfIn PDF document text
    • http://debschoen.com/userfiles/file/72418899569.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/rovirulimujuriwube.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/80357433544.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/benijelunoxugidisukemizo.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/65083656537.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/32531409992.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/14153102748.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/73706473225.pdfIn PDF document text
    • http://ttc-investco.com/img/files/fizupo.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/75107041494.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/lunoso.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/18591360346.pdfIn PDF document text
    • http://mlead.net/images/e/file/91916266045.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/21984180343.pdfIn PDF document text
    • https://afayl.com/userfiles/file/80727178984.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/lolal.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091706260241.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091408054073499.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/levisavuxi.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_off0000ada5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA5 17740 bytes
SHA-256: 70a8bfa7b584f846d1a05b8fcc7318ccaefb3fd5deffcfc458fb2a38bdb66e1e
font_01_sfnt_off0000daf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30B 10720 bytes
SHA-256: fe3919c7f481b4be0c22e8f51e6ca12ef90b3336008c313e4a8ec28d82d88b49

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