Malicious PDF — malware analysis report

Static analysis result for SHA-256 3670fcb6d86d730f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-17 17:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a757dc20e826755a9f270796bcd2e8f SHA-1: ba052eb38dcee25d4cadff081a552cdeaada7426 SHA-256: 3670fcb6d86d730f7b8aa13215d027bafa546a4e0359d7fc282c5b2819370c88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a tactic to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wiskind.com/filespath/files/20210911022622.pdf
    • http://chanhungcorp.com/images/uploads/files/56460727117.pdf
    • http://vinabomi.com/uploads/userfiles/file/98574784685.pdf
    • https://highlander-inn.com/assets/userfiles/files/munafopabiwit.pdf
    • https://oriolefashion.com/ckfinder/userfiles/files/bemojirarolubilomigi.pdf
    • http://ahnil.com/userData/board/file/51882956025.pdf
    • http://www.europesolidaire.eu/userfiles/files/76375528042.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/159c911db0958d0d65739753bf8927d0/turofezorunipirutugifese.pdf
    • http://slkuang.com/v15/Upload/file/2021916334592968.pdf
    • https://romalasergroup.com/userfiles/files/rapudivulojeb.pdf
    • https://immobiliareincentro.it/allegati/file/97014417629.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/69733711076.pdf
    • http://lyzjkgm.com/d/files/44607021377.pdf
    • http://sicompk.com/survey/userfiles/files/xemevefegorovisatakiso.pdf
    • https://reparationmobile.net/userfiles/file/zujejiwajofasexasule.pdf
    • http://cabanagarden.hu/editor_up/xusobizotujofixan.pdf
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/jedeton.pdf
    • https://springkasteelhuren.be/userfiles/file/11483439845.pdf
    • https://invest.pl/userfiles/file/7017239455.pdf
    • http://eventologia.com/userfiles/files/judow.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/61688240030.pdf
    • http://cngwalk.com/fckeditor/userfiles/image/nivulejeputuvozawotoriru.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/gupawivi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=friend+request+2016+full+movie
    • 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_off0000af18.bin
06eabae5d3b75df6e6102204162d0bc15e6d18cef56825a990c76d1a88ae201d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF18 11104 bytes
font_01_sfnt_off0000c8dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DD 16792 bytes
font_02_sfnt_off0000e0ef.bin
972bc5ce3b27c2338d24f187001cfa9eb0a7344ca519fe6336b3e479d085e60d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 16036 bytes

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