Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccf882ee85d71b4…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 15:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 295a5e15ec1a31e06752c0d2c9cef6a4 SHA-1: 14eb210523dc9f1fbb7939615fca5a45172a84bd SHA-256: 3ccf882ee85d71b41c3565b3e608e3506045afcf77b1036c1810cd529a87c241
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external links, many pointing to PDF files on disposable domains, suggests a link farm or phishing lure. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or downloader precursor.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jysfh.com/upload_fck/file/2021-9-17/20210917210524949886.pdf
    • http://king-tableware.com/uploads/files/202109211731392541.pdf
    • http://ddgasul.com/userfiles/file/valupopakukupotifivabire.pdf
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/74706258926.pdf
    • https://gesema.com/UserFiles/file/13128582152.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/64934487534.pdf
    • http://www.deopendeur.org/imgUser/file/21918061555.pdf
    • http://marthomaiticherukole.com/userfiles/file/pugukikubuxadupifoz.pdf
    • https://pet-fashion.ro/mm/file/57514537317.pdf
    • http://avemkz.internet-match.com/upload/files/libotiwuvezevax.pdf
    • https://bankkartya.hu/js/ckfinder/userfiles/files/depuku.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/gapizadiwozelezeregad.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef699dafa7---logurexaniwezidotasiribon.pdf
    • http://lynhuagiasi.com/Images_upload/files/82608428151.pdf
    • https://fotoprint.lv/downloads/file/83006727795.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615214a187344---52545755188.pdf
    • http://geoplan.su/userfiles/file/58273751051.pdf
    • http://intertexmedical.com/userfiles/files/naretip.pdf
    • http://area100impianti.it/userfiles/files/lefemijupegu.pdf
    • http://beveragesgs.com/userfiles/file/zevelasuxalikagulokuk.pdf
    • http://pospatrans.cz/UserFiles/File/39341481401.pdf
    • https://equimat-cheval.fr/file/65548866761.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+game+need+for+speed+most+wanted+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_off0000b0d5.bin
1f554a53aabd6101812e3e0d0a10bb35aae6929062b55a66cf0219af4bcdb3dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D5 10928 bytes
font_01_sfnt_off0000c9f0.bin
bbe31218652e2f8e437f80e682c8ba06cec2c12388dff57421cb1c9d31e3ad68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F0 14400 bytes
font_02_sfnt_off0000ee38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE38 16792 bytes

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