Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e7d500cb42eb9b…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 03:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd29a4f1e406af476508c97ddcae5782 SHA-1: 5bb14531efbb1d83f8812a1884d7273f08d1ebc1 SHA-256: d2e7d500cb42eb9b7e64ed53f0ff471665791129cada8c7805881c3572635f4e
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 numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The presence of these URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://ketchas.ru/uplcv?utm_term=six+thinking+hats+order PDF link annotation
    • https://petrovsky14.ru/docs/files/sanobiweguvezotuxa.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/viserologivebekobaji.pdfIn PDF document text
    • http://sparkpro.lv/content/file/zowigawariserakim.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614421eead54e---93561286333.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109032128312497.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/80644902659.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/mulinekufosijorage.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/rokebowurarumamev.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/94770671832.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/69647098563.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/92203010331.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210906_B20EB220F62F65F5.pdfIn PDF document text
    • https://superpart.com/files/dugamelerujazogeruzesuwi.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/61374626552.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210905141027.pdfIn PDF document text
    • http://weldingplaza.com/files/file/wulanijabapazerexoniwe.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/6161039882.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/kewosumerunolog.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/gipurufavesoxi.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/53978167853.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613095290c7f6---45163760634.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_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 18700 bytes
SHA-256: 893711946ea2480e93c1a77d6c9532013ac69912c71bda0ed4a7d29f9136f171
font_02_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 10752 bytes
SHA-256: 9d5283ae5edc7fc7336612048629117cd1d0922a9983908050323d0512c39863

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