Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5e5d1c5082010a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 01:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e043dd9bf824f2a2c531c3d8b17fd53 SHA-1: f92855e727df656999f2ab648681f39d8d905a21 SHA-256: da5e5d1c5082010ab079310ba5d9636ad68e436ed85d108307f6cdc2ede04452
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=transferring+pictures+from+android+to+mac PDF link annotation
    • http://mijinmotor.com/fckeditor/userfiles/file/86030779573.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/33425389585.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/sebitekexinewav.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/rupaxaj.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/25906058979.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/gukefojazaf.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090720485543.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/sawiji.pdfIn PDF document text
    • http://techbis.pl/files/file/65543975735.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/6667088331.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/12828696892.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/nubumajadakiw.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/89604328443.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/63701389906.pdfIn PDF document text
    • http://banquat.com/userfiles/files/28238621186.pdfIn PDF document text
    • http://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/xesibonizig.pdfIn PDF document text
    • http://effektfilm.de/files/file/37993569588.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/wolifimunegamopetiv.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/80332831912.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/miguj.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/31e5ee3a20f9fd7ce8d326f32b6af8ca/nekefasovev.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/23477921692.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/6861600314.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/juroxe.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/16124635646.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_off0000dd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1E 10980 bytes
SHA-256: 7cdfd88024f4e4c8c400330b0e065556a5db8391f17e903d61c9c31a4f6817f5
font_01_sfnt_off0000f661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF661 18100 bytes
SHA-256: 60568a6709e7f48168d3962614c4c1c4fd39ed844b12337bef46e476d7b9bf5f
font_02_sfnt_off0001252a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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