Malicious PDF — malware analysis report

Static analysis result for SHA-256 548754d2cb2b951f…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 15:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ae8b9e83507a2aca48f9e5979c6fbb7e SHA-1: 2de6014c5f0d2d57ac477978f277215d7edf3e50 SHA-256: 548754d2cb2b951f67bc5cf9cff45f79f57ad98e68f26c43d2c6bef914d33e70
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one identified as an algorithmically generated URL and another part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=bus+simulator+2016+mod+apk+download PDF link annotation
    • https://sandp-engineering.com/ckfinder/userfiles/files/demitipelegisoderajoj.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/53858049620.pdfIn PDF document text
    • https://ptogel2.com/contents/files/16716164375.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/peraxisomisomomun.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/87611097983.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/8292478210.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/garetu.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/roliwuk.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/50483039590.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/50801626188.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/vetamolumevanawevodevirop.pdfIn PDF document text
    • http://hkacca.com/userfiles/44538657897.pdfIn PDF document text
    • http://islandpointfl.com/userimages/gobepawatubazulixavopi.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/tiwixituwajevuwamotinuda.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/mebebepaguraguzusez.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/purasakuzunamazetiwota.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/15717483753.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/48521298428.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/gamupabisesenepuwudup.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/kokatovexobafajixi.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/mipisevebo.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/5390732190.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/pabujivozolasiworeni.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/84999307767.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/laturibevorati.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_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 11212 bytes
SHA-256: 7fa07bb53afb9cf36216c7cfbf7a4b6b335a6b133aa9d1fe9525668e413195fc
font_01_sfnt_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 17436 bytes
SHA-256: 2b7696a706976362f6b0df08402d529538427f1407ffd63a936ccae42644f5c4
font_02_sfnt_off00012cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1