Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79a56da44956234…

MALICIOUS

PDF

94.6 KB Created: 2021-09-20 02:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7b4164c96cccf87c3c214a75d75714d SHA-1: 47b9978cc87623b28d2ea5d312b1bac8633c27e3 SHA-256: e79a56da44956234da8fc99cae8d031dac15aa1661acd90c9678aba8fdc7b739
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this behavior. While no scripts were extracted, the structure and heuristics strongly suggest a malicious intent to redirect users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://coffeetuanvang.com/Images_upload/files/paridutirixanibiti.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b373252ba3---26998718500.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17ef83a0c---zupebilujikanivam.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/26610399059.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/86938067082.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/xodamoke.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/70551076927.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210912151614.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/fiwimevi.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/figadikonogasifexuxatut.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/44687747627.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/jewixew.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/lituzibexap.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210909083049.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/zurikonebidefefiwufitupe.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/8528038497.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/87541872180.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/sapeluwutikipi.pdfIn PDF document text
    • https://limsurdua.com/contents/files/piromijinurimugidefamo.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/detinafedefulurag.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/36438921429.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/xejafisobumo.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/kaberoziniwamaputareb.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/37003247956.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-11/20210911131316740164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=the+meursault+investigation+pdf+free+downloadPDF 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_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 11160 bytes
SHA-256: bc83b43bf5d580afa8be004fd9c30345ea44d4b951c3dccbfc4757d0daf18fd8
font_02_sfnt_off00013849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 20332 bytes
SHA-256: 773e3490e045d74ef60467fe27dc451eb747192e2e71ac0398a989c1b546111f