Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc098d30612f87f…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 21:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 002c98fa98b40fb15de710930e7ea757 SHA-1: f55b0182e1e01d6f3c63f2b3d6b6b43a03cf615a SHA-256: 0bc098d30612f87f6e3015b79fbf8e894e7121629d9579cf796518923ab36d9f
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of embedded URIs and the nature of the link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://majortaylorride.info/images/uploaded/file/boluvep.pdf In PDF document text
    • http://cross-winds.in/upload/contents/images/images/devupadaxiwudodilibosi.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/1468606642.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210918115007.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/90499212977.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/85838596345.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/20724745587.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-20/20210920061026234908.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210909183105.pdfIn PDF document text
    • http://fourfoods.com/images/files/28001753565.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/dujozimop.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/gomug.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148ae0f38daa---sapiximifonezunus.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/45752065977.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/damodemexojogojova.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/fokerukemojipibut.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/mizuzubopemimejuvixe.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210911192018482200gycpu.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/95407592256.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/damugovopovexezuladulo.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/65763682667.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/78205712235.pdfIn PDF document text
    • https://sme.bankai.lv/ckfinder/userfiles/files/65788729705.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/70389984350.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/wopinoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cote+in+englishPDF 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_off0000afd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 15816 bytes
SHA-256: 4603c92db440b8a721d6938be6d5fe4782b86eb3f17ed744fcc4e2790bc37a64
font_02_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10156 bytes
SHA-256: e7a9c1ba2116ceee6a46a695636cdb94a44e6d8749323c05f48661595419670b