Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b6e969c34b55e3…

MALICIOUS

PDF

86.8 KB Created: 2021-09-23 22:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81f2e5b0f388bb5edfc127c8e8abc4f2 SHA-1: 7dc744b8f1005a9dbb7aef1b1a58670a26edd57a SHA-256: 44b6e969c34b55e3144011aee6dca613ef992fc713207704c4e204ffd8362f6c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, indicating an attempt to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic identifying it as a link farm on disposable hosting strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://archism.ru/uplcv?utm_term=pokemon+fire+red+version+rom+gameboy+advance+download PDF link annotation
    • http://miskolciharsona.hu/pictures/file/78138579599.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/rudevexewafak.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/jemiki.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/61557248067.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/gotowuwozetaruza.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/62106153197.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc52a03b1---wevenijipidevovojopisibe.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd1b1cd75---fefuretere.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/3071058536136639cdc186.pdfIn PDF document text
    • https://iwistw.com/upload/files/26766583628.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/kiwawon.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/9128236900.pdfIn PDF document text
    • http://lex.tj/img/file/selolupilubatofu.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/fekuzujetibesefunibas.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/72277767509.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/sujidebisomubarazuf.pdfIn PDF document text
    • https://podimercrm.com/img/files/zefapojedow.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/68111070214.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/junidawado.pdfIn PDF document text
    • http://suamayphotocopy.net/userfiles/file/43298790349.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/26650294823.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/xijum.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_off0000ecfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFC 11220 bytes
SHA-256: f79e3ef691415ab0353f4ef9bf4327ac0caf746100fb8bf9ee533876fa5998e4
font_01_sfnt_off00010727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 17644 bytes
SHA-256: 2488dc94a28d5ec33a496813b1ea60bef86d2bbef788f2d08be0a8a903a11b0f

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