Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e912dd72f0c8b7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 05:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e508ecd88dc7bd949262ea0cedb0c936 SHA-1: ac127954420ca4e52e9009bc0795c94403ac6099 SHA-256: e2e912dd72f0c8b73be0ed6e001ba9154f8db6a6f47b20a6b21cfbaa4af3d3b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous external URIs are embedded, pointing to suspicious domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=file+manager+pro+mod+apk PDF link annotation
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132542f35f57---23952783387.pdfIn PDF document text
    • http://ty-int.com/files/files/disulogefe.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/wikikukizixifevi.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/vavadatexeloxoduxu.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/34156959954.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/38426765883.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/ziruwuj.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/wapewinit.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/venakawepogiwa.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/kirijubuxetekaberuzuzofad.pdfIn PDF document text
    • http://vln.nl/files/file/36981809974.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/setazulob.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/fafomemebefoxuwofeje.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/39622753419.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/vefixovedimujonotom.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/10834163265.pdfIn PDF document text
    • https://bloc-immo.com/images/98031199625.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/11540691495.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea40f9dbfa---jejerukurutekejoja.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/77929260808.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/xawogekopotefasota.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/titewalem.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/10662575122.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/46060918950.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/zefamomizubefodabebeji.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_off0000dd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 10536 bytes
SHA-256: 95d6790d8c14dc425ddfbf099d8c71a724acefc16d4eb2ec3c1329a497e59898
font_02_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 18480 bytes
SHA-256: cf4e3de85e201e259385c69fd1dd716db67fc2715394d1f95a08e5fef146fea5

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