Malicious PDF — malware analysis report

Static analysis result for SHA-256 972add550c69e636…

MALICIOUS

PDF

76.8 KB Created: 2021-09-15 12:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b537bc044a12689fd64040c153b20494 SHA-1: 33d5b79cd7db5fb98af32cfc074a9cc928268660 SHA-256: 972add550c69e63633b296dea34e908dbf0dbd0bff24be951cd28ad68e031edf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a link farm on disposable hosting and a high ML score. It contains numerous embedded URLs, suggesting an attempt to redirect users to malicious sites for phishing or malware downloads. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://wastran.ru/uplcv?utm_term=omegle+app+apk+download+for+android PDF link annotation
    • http://urbanelect.com/userfiles/file/bikujo.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/xokurob.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/gozopedafizeru.pdfIn PDF document text
    • http://travellerisland.com/files/48781004221.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/13331603426.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/14868509169.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f28340283e---19368133.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/kogobokudogetikevalul.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/takurem.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/guwereralelepop.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/57553299594.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mavugirazobumimaleku.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/daliviserilefega.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/xinalebaterozorar.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///84707980000.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/65526734555.pdfIn PDF document text
    • http://sro52.ru/uploads/files/90940803169.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/susajikajomuwedew.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/tuwasafeparaki.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/xedaxelujasopedupapowatoj.pdfIn PDF document text
    • https://binhvi.com/upload/files/keneninosemerox.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/faloz.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/gadanelixizowekadibaja.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_off0000c55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55B 18988 bytes
SHA-256: a62c7534fd58bc76339504a05f88f8f02d5616ef9eccc57f9a0d6410674817d8
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1A 10776 bytes
SHA-256: 8336b076d11d671e86ea5a4f36a91faf0a17d239cc461b977c1a220f1f07c9bc

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