Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb9f1bef2c33ee06…

MALICIOUS

PDF

81.4 KB Created: 2021-10-11 18:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7d0f9795c1fac415691b757b2a82919a SHA-1: 5c4053c89f0a559e3f2cef90e581d8f82e9823ab SHA-256: eb9f1bef2c33ee06a00da902757144c8b81e031701986074428def143deda1b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/p5c3bi1vvohm6j01c3v92s3ce4/84625781526.pdf In PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/37145992503.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20211003005041.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/98fe2677aab025ab55bf17805d1ab3c9/xudimebiwaxekij.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/17940534236.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/sizebifexijekopo.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/75922675166.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/99380160739.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/38641210078.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/degopilonupilupobakexixix.pdfIn PDF document text
    • http://skupka23.ru/upload/m/nipeletefapib.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/zomukulivolorajada.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/somuj.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/65211312328.pdfIn PDF document text
    • http://orderkai.com/uploads/files/zixeguranebagapo.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/94733915188.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/jarimonutavorop.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/70843035685.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/benemus.pdfIn PDF document text
    • https://akemi.ro/hirek/file/68236630105.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/roxipojeropusarexulejo.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/1975586634.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/fumovisugakegipasesupisi.pdfIn PDF document text
    • http://paradoxine.com/upload/files/fikujarujikudab.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/cmwvf4RlXg4/uplcv?utm_term=rest+in+peace+quotes+for+my+auntPDF link annotation
    • 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_off0000dac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 16964 bytes
SHA-256: f7b3351148c83d99fce0b4a1350a329b73bc7f224bb89e722a5c8ecdf5f61a63
font_02_sfnt_off00011e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E00 11000 bytes
SHA-256: 33e23bfeb5e54078add1340c9492c764ce05c91e2e963cde2740a9ddb63900d3