Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc367392d7482dba…

MALICIOUS

PDF

71.4 KB Created: 2021-09-20 14:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f58c7a14ef217e19136297e7f224c047 SHA-1: 7d51463485f19192841324abdabb7827228c2752 SHA-256: dc367392d7482dba5a7482b4ff1ddad5ca0c64b7d1ebc61f5677c4f4609fc13e
134 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 embedded JavaScript and a high density of external URIs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document functions as a link farm on disposable hosting, likely to distribute malware or conduct phishing. The embedded JavaScript stream is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=ace+attorney+mobile+apk PDF link annotation
    • http://drentmedischadvies.nl/uploads/files/33777155536.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/54653192352.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/84406976269.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/gefukukafulaxojoxemab.pdfIn PDF document text
    • http://contextuae.com/resimler/files/bemab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348fe71470d---kodukofatugegadavad.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/59935125539.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wozevagowosigim.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109171946529363.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/tegipewekigawitufexeg.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/26112179415.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/duvepadetitoli.pdfIn PDF document text
    • http://e-district.org/userfiles/file/bogirumatasudom.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/23246439157.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/47824454732.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/75029078636.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/pugewugijojosukot.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/nedezukenofefivijunuse.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/jepewegas.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/putalemesisorogasolag.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/64016129129.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/49106082352.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/gokosovalekir.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_off0000b3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD7 16932 bytes
SHA-256: 7d575a1e123be4118b00940d2c5caee45d3d2f470b9c6772dc051f7caf0ae5bf
font_02_sfnt_off0000f7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D4 10692 bytes
SHA-256: a53f36a440886476b5d411ef47c0ddf12ebb0734d1fcb0bafb3997d21b24e4de

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