Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fd8721349fd448…

MALICIOUS

PDF

78.5 KB Created: 2021-09-17 14:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6aae1ce0bc7569edaef0a2b92693dcb5 SHA-1: 603599b6e195134f1e5d1c04a7cfe5512c9d926e SHA-256: c4fd8721349fd448f6dc0cd532444353d143f11b50c5b5a671dc920d3e75bef9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to unknown domains and are structured as link farms. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://svb-volleyball.de/userfiles/file/ganisadosagagebi.pdf
    • https://spheresignal.com/app/webroot/userfiles/files/nuvusamakijevevafutozime.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1c936cd7---33757662715.pdf
    • https://parklanehotel.asia/userfiles/file/xoxodadinaxukifijisisib.pdf
    • http://alt-1c.ru/userfiles/file/92009310169.pdf
    • http://langeline.com/ckeditor/upload/files/78757092736.pdf
    • https://glaze-metalart.com/upload/files/5247334538.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161437485d1fab---vemukotobumubuwuki.pdf
    • https://erdenetpost.mn/userfiles/files/rudalazubabozozekipepame.pdf
    • https://mehreganimaging.ir/images/upload/files/xafixizizorotaduwedix.pdf
    • http://chieucoingason.vn/files/kakuwiwotodabomisemaripe.pdf
    • http://f-kcc.jp/user_data/userfiles/files/21852682833.pdf
    • https://bahispesinde.com/gnc/veri/_files/teramabopotofed.pdf
    • https://keepingscore.org/userfiles/file/36990162929.pdf
    • http://icoenergia.com/userfiles/files/76799511120.pdf
    • http://igigeothermal.jp/userfiles/file/47355956435.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613699ce564e6---17898750465.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/jaxexigugelumozigikifo.pdf
    • http://mazraeir.com/images/upload/files/denosovevutofebimu.pdf
    • http://land89.com/ckupload/files/98186121754.pdf
    • http://lutechmed.com/Images_upload/files/jarabiwatujevafuw.pdf
    • http://terredellamagnagrecia.com/userfiles/files/pukinug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=minecraft+story+mode+free+download+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_off0000d04b.bin
355e1424dfbd07bcec58cac136744a19fa90c4211879a63edc77165adabf1a00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD04B 16588 bytes
font_01_sfnt_off0000fb27.bin
840db14b53ab45c6adaf62c65026854d3afa8a202ae7ef4f05aae53c43cc51e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 10832 bytes
font_02_sfnt_off0001143a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143A 16792 bytes

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