Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fe6943429c5b07…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 16:04:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9cc4e57c699a1e8992a51d9799918a2d SHA-1: d133a0b062493063a8cd462ee14a81ddef1eb722 SHA-256: 31fe6943429c5b07e10e4cb59f43e5e1dc70b8b492de29d2f2dd576e85be276d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, indicating a link farm. One heuristic specifically identified it as a link farm on disposable hosting, suggesting a phishing or SEO poisoning campaign.

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://bsa.by/ckfinder/userfiles/files/93843432668.pdf In PDF document text
    • https://tspinstruments.com/cache/fck_files/file/datuzabime.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/98028995343.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/65425443595.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/mirupoju.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090218253652.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/52642940574.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/tiwejoxozuxorerax.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/62646813750.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/retiwirununetisuzodu.pdfIn PDF document text
    • http://cnfglgreat.netsociality.com/upload/files/71647411898.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/53438483763.pdfIn PDF document text
    • https://atrax.hr/files/73822688298.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a070a6ab42---vilegi.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/mujuwixevafodaxitovibuz.pdfIn PDF document text
    • https://banifatemehmashhad.ir/userfiles/file/murajovepesalutidagujinej.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/gufip.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/xapakopolozegaja.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/fobulopilub.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/jenejorusagotefor.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/dufobitukezo.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/gorubugasemefazoduwefataf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cara+pasang+game+ps1+di+androidPDF 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_off0000ad86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59D 10672 bytes
SHA-256: db0a1914d3ee68af18f706757ba68958bca5bb7ecfc6a76aa3b1adb5fe0b16ee
font_02_sfnt_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 15468 bytes
SHA-256: 1b7aecf4fadd06f621708bc07591e47017d3fdc40ef9ef0b325e181bead11f29

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