Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d7370385032d0d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 05:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca80ad9afbc18a6443e7afdaed41ee61 SHA-1: 997809b89411fb4d55a384761563e5ecbca5cb3e SHA-256: 42d7370385032d0df0cfac90533b6b16bdb7d67fa813c5ca44bb9c2506d68d75
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate malicious redirects or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=how+to+compress+video+size+in+android PDF link annotation
    • http://music-summer-courses.eu/upload/files/nopozukasowevereganotepux.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/43455135626.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/49157629278.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/56858797364.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/dogoge.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/farejuvurafo.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/74650384883.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/30448267276.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/55786158301.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/tesofamibunazevavowoj.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a060d3055---jowopaxuvizi.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/89967558305.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/71988216490.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sefixonodozutofozorol.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/8370829602.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/63438400271.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/44286290482.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/varikarure.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/wivifugukaxagumik.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/vovibeliwutumujeware.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/84465139772.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210901215641.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/80557870018.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_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8D 17548 bytes
SHA-256: c9a37874e83d7c14cb61d4625a6350a1d00463563f65f02b8def1e7fc7371e38
font_02_sfnt_off00012a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A24 10832 bytes
SHA-256: 2cfe60ead7ccd0bce3a0bb11eebe29352e7c1cef70e3f3f598dc6ed37232364c

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