Malicious PDF — malware analysis report

Static analysis result for SHA-256 526c3a9bd0fbffd7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 21:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5817cb485264b47f2fa35123c23f4d1a SHA-1: d887e2946332bf5ea4bab0aecbaaa4c90c53e3e5 SHA-256: 526c3a9bd0fbffd7ca0669d757b86510eee7fd70626264edf3b5ff85b1ec35d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many pointing to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior as a link farm. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=do+androids+dream+of+electric+sheep+read+online PDF link annotation
    • http://lehnerkom.de/images/uploaded/file/39228305506.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/32669169279.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/geriwuti.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/4382675940.pdfIn PDF document text
    • https://ubranni.com/uploader/files/purulujilevawewipaji.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/kisodewafefijabuze.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210919_573584213336BA96.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/98392649226.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/mefefafifesu.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/muwelegi.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/misujuvorefanad.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/56285665705.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/26968635283.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/54814023946.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/viluxutufor.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/79994269777.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/kumasu.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/zuzovef.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/vebujuxewotufajaritu.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/nalix.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409d2be907e---tajubofiv.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/81375396306.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tafofazinubutezipazud.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/faweregenibibajefetub.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_off0000d8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A4 18460 bytes
SHA-256: b6a531b5f142d4e9589151e04ff5b666433d4df63295ca285f9bad89c59ff952
font_01_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 10888 bytes
SHA-256: 10cbbb5349290c6d5774ebdc2b414fd4f71b95d82f871f858f3316c431bc596b
font_02_sfnt_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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