Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf52967d074dc6c0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 02:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22bd1e35ba7de772986e4570de50b075 SHA-1: 2e450452a4f98a4ce6cc4dc9208250db49a6d9e3 SHA-256: cf52967d074dc6c032016722f751f70a7515ab36edc32dd903ca787bf5bbcb38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple domains. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/54424814235.pdf
    • https://alrashed-alsaleh.com/userfiles/files/29157263944.pdf
    • http://hanmih.com/userfiles/file/20210918073525.pdf
    • http://wittlich-luexem.de/userfiles/file/fizugowawozenodejaxoxu.pdf
    • http://henskeschildersbedrijf.nl/upload/wapilategafuj.pdf
    • https://dpt-mh.com/uploads/news/files/bakujikidiluliduluvudegal.pdf
    • https://fainitelecommunication.com/public/editorfiles/file/6062240809.pdf
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/85826531034.pdf
    • http://jgbt.us/pds/userfiles/files/34095565610.pdf
    • http://momsystem.ru/public/file/93794364603.pdf
    • http://vidol.eu/userfiles/file/bavujadetopaj.pdf
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/norodibezobipipafajuwa.pdf
    • http://vucert.vn/uploads/files/98011083377.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/43665923597.pdf
    • https://webmedcentralplus.com/userfiles/file/94378903374.pdf
    • https://congchung7.com/upload/file/varolakaketutebanubod.pdf
    • https://idroilektriki.gr/files/file/34836331060.pdf
    • http://rsport.eu/yonexshop/static/file/tasebe.pdf
    • http://stagelight.pl/userfiles/files/2060010699.pdf
    • https://nevjegyzek.eu/uploads/file/fakapekitenerutugijibob.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ad30da4c580ba1fc9a1afaff096e49f0/41330938257.pdf
    • https://teamcode.net/upload/files/retedujufuporixewotexede.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=connect+wireless+mouse+to+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_off0000da2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2D 16792 bytes
font_01_sfnt_off0000f23f.bin
2710e2b33cabf7453ecc98c2e816fd9147118ec8aea775d677f7b38d75878e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 17812 bytes
font_02_sfnt_off0001205d.bin
0b8800780b0f97aecc329683b7cc56978b3aee2c1aa86da621864864d25f726b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1205D 10748 bytes

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