Malicious PDF — malware analysis report

Static analysis result for SHA-256 4335e6f21188e089…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 18:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bcab9dcc65268a040b8d477af6621a33 SHA-1: 06f755485f92c72a676ef41127f1799ac79e44d2 SHA-256: 4335e6f21188e089f227fa546b7698e9e3c6c299354a9cda72f762ab71aaca96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The presence of many unknown reputation URLs further supports this, as they are likely part of the attack infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://djk-winkel.de/images/uploads/file/74019367957.pdf In PDF document text
    • https://tidurmalam.com/contents/files/potogokikulazo.pdfIn PDF document text
    • http://www.pvvc.cz/files/wukapolawamawuxa.pdfIn PDF document text
    • http://showpelec.com/data/file/20210909_112237_355.pdfIn PDF document text
    • http://checopharma.com/upload/files/dixabezosasojax.pdfIn PDF document text
    • http://tai-group.com/upload/files/942858656.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210913161031.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/10232349071.pdfIn PDF document text
    • http://kd-council.com/upfile/files/17800695984.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210916_005715.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/lopezoseribu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c9b029f0---witoj.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210913_9_51_17.pdfIn PDF document text
    • http://esangsok.com/upfile/files/paxurebi.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/nelonu.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/78878003481.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/xadivanekobeza.pdfIn PDF document text
    • http://kleiberit.ru/files/file/disuwomumezemisosuno.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/020c2538e8b5cd2c1786b7b1fdc7a40f/70329620438.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/jesagosevilizaju.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/11342408332.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/12679381026.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/fatixev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=calendar+not+updating+outlookPDF link annotation
    • 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_off0000d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 17516 bytes
SHA-256: 251b4a524054660890a9eba0e2a5fcdb711f877f6e87c6967141583531e0f81a
font_01_sfnt_off0000fd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 10624 bytes
SHA-256: bb33c4c43a473042c4472ffc1327d6b415ea08710673497ccf0230888b13b8e0

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