Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a487b5eca74233e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 14:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4d94173d5a2343d1c90ebea7ee88434 SHA-1: d4e15912533db5658564f0d1a2067b25e78015e5 SHA-256: 5a487b5eca74233e2afa7e79a67cd4a9deef243f25ba892a1c80a337c2091ac0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous links to other PDF files on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://digitalqwerty.com/ckfinder/userfiles/files/68668417710.pdf In PDF document text
    • http://toroisg.com/public/images/files/pesifoteratikemirov.pdfIn PDF document text
    • http://voijin.com/userfiles/files/rulexorosanetepeduzebaje.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/36404097241.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/zanegumimabojejevub.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/87310981922.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/gilomid.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210910114957.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/77809889093.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/89346851350.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e22b1e8b---26192423583.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/giruwivaxifaralonenok.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/lesadalazideju.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/81638352141.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/newasegamaradafuko.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/tisebavum.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/gujufu.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/63101377078.pdfIn PDF document text
    • http://fourfoods.com/images/files/kosibodoworopex.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/bevosideta.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/kopulogifazubo.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/45346759409.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/gipozizudoborosoj.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/xedusoxokuxeg.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_89FA979AF91DD232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+know+the+person+who+visited+my+instagram+profilePDF 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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 18284 bytes
SHA-256: 0e82fc62079b6ac2cb925da918d4d031309e40cc657a438ca22a7414b0f3fa03
font_01_sfnt_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 11296 bytes
SHA-256: 50f334d25d7088072d09a6cc9829deb87c1186c39df833af76d6ccdbb8d539bc

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