Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f156d5ddf48385…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 03:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aa515670bb1c1496afe5378f7086e40b SHA-1: 63c963fdcecd6336a4b0c6495e424b9e8e8d31c0 SHA-256: 42f156d5ddf483853c1eae4a4a88c01a9c3e1d64c1fbf9ba9e0f40c427d0a777
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.colormotion.cz/UserFiles/file/40523155182.pdf
    • http://prmakeup.com/Image/files/mijojidokixeros.pdf
    • http://newabel.com/ckfinder/userfiles/files/jilikifikasekusura.pdf
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tazixugumit.pdf
    • http://holidayservicemarsala.it/userfiles/files/67993199645.pdf
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/mipufaxezozimefub.pdf
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/63057186503.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/mijomuvevowitofitawi.pdf
    • http://indemo.pl/Image/files/dugajajagebegozadu.pdf
    • https://emailing-online.fr/uploads/userfiles/file/xetozanu.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/tilibixofi.pdf
    • http://bjqyms.com/filespath/files/20210903212115.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134777dd39fa---23316001946.pdf
    • https://mehfermobilsaglik.com/userfiles/file/99093293124.pdf
    • https://nazragame.com/calisma2/files/uploads/siwamojamepusaw.pdf
    • http://mptech.vn/ckfinder/userfiles/files/32127121032.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tipijotamamodesoge.pdf
    • http://wccflooring.com/userfiles/files/kaluweximinixedejajuku.pdf
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/51384959887.pdf
    • https://ccskin.com/geektic/files/53948556341.pdf
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/darebudeduwut.pdf
    • https://wsbtitan.com/images/file/52394294297.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=gta+san+andreas+iso+psp+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c7.bin
3cde57d154f9be03a07853ff3891613df409ff4f086a5fd7be8c64d3679514b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C7 10376 bytes
font_01_sfnt_off0000ee60.bin
2389072500b60621e93aa71bcfeffabb08d53bcee4a68bf6cc7362ca3ec2a7db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 17596 bytes
font_02_sfnt_off00011c01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 16792 bytes

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