Malicious PDF — malware analysis report

Static analysis result for SHA-256 a769c34a59d9728a…

MALICIOUS

PDF

115.1 KB Created: 2021-10-03 23:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05aa2fe1f1d65993cdffa9174881631b SHA-1: 5c5e92117344b44d6b120a9abee544268aedf69e SHA-256: a769c34a59d9728adfec020ada836d31d5502ebe39eb3e7bfb0294b0eacb6a9b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports the malicious intent of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://skatrip.com/basefile/skatripcom/files/xekuvumomufigebukuni.pdf
    • http://hagelkonzept.de/userfiles/file/penexevesej.pdf
    • http://mega-gold.com/userfiles/files/nawexapikoxo.pdf
    • http://www.lalorraineperdue.com/documents/tabotidovidi.pdf
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/faridafurelu.pdf
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/1884265435.pdf
    • http://temdientu.vn/images/ckeditor/files/felesowupikibozunefopevus.pdf
    • http://uptindia.com/newsimages/file///matag.pdf
    • http://elsped.hu/files/file/xiloramuzowavinetow.pdf
    • http://paneldeconsos.com/userfiles/file/13125503894.pdf
    • https://stancijanegrin.com/UserFiles/files/78388087195.pdf
    • https://granitnet.hu/editor_up/37082132607.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/27ee0f1d778c8ed70c7a879d82d3a131/serebilomaxulanitulit.pdf
    • http://denprokhorov.ru/images/file/risenilenuto.pdf
    • https://tuyendung.vinaonegroup.net/upload/files/duvenagisibivukawixosejis.pdf
    • http://atrsara.ir/resource/files/99877136987.pdf
    • http://superfishinglewood.com/uploads/files/ranugarop.pdf
    • https://mongolia-volkslift.com/uploads/files/sezivaxutamusagaborawuxaj.pdf
    • http://letresorellebio.it/userfiles/files/dinanorapob.pdf
    • http://dogable.de/userfiles/file/fugas.pdf
    • http://fred-robin.com/ckfinder/userfiles/files/21611282092.pdf
    • https://aczv.fr/userfiles/file/91263911977.pdf
    • http://amoy-art.com/Upload/file/38664785055.pdf
    • http://thepokewave.com/uploads/files/63752948269.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/zedorilisibilexezib.pdf
    • http://giprozdraw.ru/ckfinder/userfiles/files/74626966995.pdf
    • https://felicityokolo.com/file/27087506811.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hpi+config+for+pc+2020
    • 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_off00014fe1.bin
496c1c6a57fc08e256769c64ccaecffa5296cbf87d48682b82adfee0cf96e2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE1 24076 bytes
font_01_sfnt_off00018dc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18DC2 16792 bytes
font_02_sfnt_off0001a5d9.bin
ee77dca063ebcd53e300f4ff63967bddca80b838d5a99b9baeace0465b6e826a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5D9 10280 bytes

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