Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4e624660dde2e5…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 17:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 269d83b42e747818b6dae920039de7ff SHA-1: 58680c0862e9755cbc2811d69b8d71a978250fa0 SHA-256: 3e4e624660dde2e58ad6192bf644dd09d493ed41dbb08e93809dad7e816edb5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple domains. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=ps+app+download+for+android PDF link annotation
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/zimulamom.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/59574254070.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/lerewupuxutovetug.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/82516427691.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/48324127848.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedb2bf2aa---73074105423.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/nekudedinaf.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/nepibuxela.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613512f5cbcac---18613287094.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/49724128929.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/21135491424.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/55236510864.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/womomizexiwif.pdfIn PDF document text
    • https://hsse.cl/files/ruvivagi.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/45635870761.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/5222442188.pdfIn PDF document text
    • https://castel.ro/userfiles/file/45681326591.pdfIn PDF document text
    • https://tpk-m.ru/files/file/62772685869.pdfIn PDF document text
    • http://usateatop.com/_upload/files/bolibejibejizisosudovu.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/74332779007.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/89478071583.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/logumokitefux.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_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70B 18156 bytes
SHA-256: bef27a19af572aae1643188c12b486f94577b239713d747e578dd34d4fa98e82
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 10348 bytes
SHA-256: b11b761648e4cd1388de13116f6da77f138eb81bc85eb8977ad456d516559bc1

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