Malicious PDF — malware analysis report

Static analysis result for SHA-256 604c5aa0a7e15a5b…

MALICIOUS

PDF

86.6 KB Created: 2021-09-11 22:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d0b13e86628eb07499af5b89e3141b9c SHA-1: 348c3e96c8f892713964ee3730cf474ea2edd82f SHA-256: 604c5aa0a7e15a5b460713077e3c9653fdc3bd7732236b5bcd87726938bf40aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful sites.

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 https://queure.ru/uplcv?utm_term=best+android+calculator+app PDF link annotation
    • http://garankuccu.com/upload/fckimagesfile/3893e49152cb3c627b068c2394120dfa.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/dilodosimonanuzanarawup.pdfIn PDF document text
    • https://btegypt.com/file/78502220565.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/19475028580.pdfIn PDF document text
    • http://airfa.it/userfiles/file/51525480874.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/85831926149.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/soxosamofage.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/xerofegukabadoma.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/98291283636.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/puzif.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/lugikoboxisokut.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210905042722922.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/49792969743.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/60652741515.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/45423677709.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/negegokiwosew.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210907091708.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/40700245572.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/8148623812.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1631089491.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/35676837973.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/tixetux.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/15616877673.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/ronejosir.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/kajobexar.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_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 17180 bytes
SHA-256: 97511b250791397b288cde8abe8e02346bd3435328b9233b3f9b0dae83c769ad
font_01_sfnt_off00011bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDC 10660 bytes
SHA-256: 173b4e891b8537195a96274723d0966dcde4ef1666e6484d5791b7fbaeea04c7
font_02_sfnt_off0001346b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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