Malicious PDF — malware analysis report

Static analysis result for SHA-256 510687c915a04391…

MALICIOUS

PDF

70.8 KB Created: 2021-09-29 03:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d648d60cc6785d3569b46c79bec129a4 SHA-1: 908681ed87881a4c23d6e87605c6f53b2bca576f SHA-256: 510687c915a04391c355a8ef3153e534e2134fd160fb6e8e726841054380c874
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and the presence of many external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://trunghungplastic.com/luutru/files/kulizot.pdf In PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vegibegepuguvej.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0fd7a339---32135631630.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/45381334832.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/zenakozenijiwobeb.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210912_060759.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/laxuvivopetifupotef.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/wimawidixaden.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/48824615544.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/27104552131.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/rumixal.pdfIn PDF document text
    • http://rayanchem.com/d/files/dotelamijulerobef.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/54742736243.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/dabusofim.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/11722823229.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/dukilufa.pdfIn PDF document text
    • http://hijoin.hu/editor_up/bugekagizopelarewexijonev.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/29963209748.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/balolorux.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/kudubenunugovulob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=only+for+one+night+2016PDF 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_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 17180 bytes
SHA-256: 7e5569c6ae003320a051d94e83b162f7e69b41622f61f2dd1e478a24a90f8eae
font_01_sfnt_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 10764 bytes
SHA-256: 75aa9c4a675e9777e25efb9964e45f89cb7d33351da341e3d4b043d066612b30
font_02_sfnt_off0000f5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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