Malicious PDF — malware analysis report

Static analysis result for SHA-256 15db60e2bf78cbd5…

MALICIOUS

PDF

75.7 KB Created: 2021-09-09 13:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c440d31680da6ea7f1dad51c3cbec165 SHA-1: 552701257b0731c3f3b53a88dfb5fff72a79151e SHA-256: 15db60e2bf78cbd5f9db8a90a8941300eb0930611085a5ae82236f521e998b82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicating a link farm structure pointing to 24 distinct hosts. While no executable scripts were extracted, the presence of many external links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.donboscovizag.org/images/files/zegeze.pdf In PDF document text
    • http://ankaraeksioglu.com/resimler/files/zupalere.pdfIn PDF document text
    • http://feg.vn/uploads/files/jaxorisigupiba.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/9442441024.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/51193204450.pdfIn PDF document text
    • http://jljemc.com/upload/files/kiwuwajufipasozexit.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/82760512327.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/96346884604.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/josozazefubimikabajakeja.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/94755526879.pdfIn PDF document text
    • http://thevale.us/userimages/gipufogol.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/50685502994.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/bijukapizevosomufaxopo.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/texakolinugale.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/totonexetopoxixufab.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/ditovuresajovugom.pdfIn PDF document text
    • http://arucax.am/user_images/file/momulalasadudamopuzono.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/xefinitutob.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210902_86BC90267FE0FF40.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/76817179073.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/nofaluxesagamibixow.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210909025939.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/30164631226.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/28726596618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bb+racing+hilePDF 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_off0000c01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82D 18884 bytes
SHA-256: c2442ed13493a0f5282d1ba8fcba67f264fb38797795623438c2a3d6f5766e72
font_02_sfnt_off00010915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10915 10316 bytes
SHA-256: 17256dedd638dd6a144944fa9ec53eb1dbfd6a4f0589234dc7ad9c7914a42dc4

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