Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bdd42f873059af…

MALICIOUS

PDF

69.5 KB Created: 2021-09-18 02:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a9a2f4048cb235ea22f73b8a77b18aba SHA-1: 3983451f1749a86d9684d7e8263764b0dc6a2510 SHA-256: 48bdd42f873059afca54fe92c9d40f273c1b230d7efca8dba5e64e0bf20a5bb8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users to various malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=authenticator+apps+for+android PDF link annotation
    • https://termokingbt.com/ckfinder/userfiles/files/bovukutewapivamuzipuropo.pdfIn PDF document text
    • https://ienter.bg/files/83971013305.pdfIn PDF document text
    • http://halanmilk.com/upload/files/bosetomelixo.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/65101218831.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/kolufikixitefifenubuxol.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16308676961372905890.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/94855046734.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631946910.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/57cdb593005e937960700e0147f588b7/lopofakugawujefanofujo.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/79694878389.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/gezosukimi.pdfIn PDF document text
    • https://tgvl.in/uploads/fck/files/74317976205.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/jusemigun.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/64397900337.pdfIn PDF document text
    • https://eclearusa.com/images/file/kexopatijafaza.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/66270619959.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/4639808501.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/nidunukiwowowa.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/51915190547.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/doxenisukawuj.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/muvunexoj.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/loliduzebod.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/31941926836.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/27675760747.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/94783463341.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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 14604 bytes
SHA-256: e1dd6592c97b56b7e0931858eedb256313c29eed894bdeb13e2fbaec73971d6f
font_02_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 10752 bytes
SHA-256: e2653891fdc74874b0c165ea71ea3f874f98dfa4178c6f7f99f76521138b4e8d

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