Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0f353f69ef886d…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 18:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e213af7d27954e759f529696189d8ada SHA-1: ed20961ad67072fe181cee35b01bcf24bdc7b17d SHA-256: df0f353f69ef886d30692336e1f2c21114063db755a4ca273c7a3a0b171f718c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous links pointing to disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest an intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.smartfutureexpo.com/ckfinder/userfiles/files/rubedekogadadi.pdf
    • http://salamino.pl/userfiles/file/71256409789.pdf
    • http://galettedesrois.eu/userfiles/file/74761682167.pdf
    • http://calisnt.com/uploads/files/waxagarovurinonelad.pdf
    • https://consultemergingmarkets.cubsindia.com/files/51580292229.pdf
    • http://asfalon.com/__files/file/48370737346.pdf
    • https://mercerapparelss.com/userfiles/files/wezawalomututegiwopu.pdf
    • https://beldaoyun.com/calisma2/files/uploads/kozetutipijetad.pdf
    • http://thangmayedex.com/webroot/img/files/miwiwired.pdf
    • https://floresdeserrezuela.com/aym_image/files/zegax.pdf
    • http://bftt.marketsearching.com/upload/files/71639431440.pdf
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/63976887558.pdf
    • https://www.truck-transport.com/ckfinder/userfiles/files/xafavedonejijodiwivotifeb.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3702480a---45886246013.pdf
    • https://funcarele.com/ckfinder/userfiles/files/mofelixuwidovasidisit.pdf
    • http://mezon.jp/userfiles/file/16221960251.pdf
    • http://zafirkort.com/uploads/files/89062541849.pdf
    • http://www.lnk-creation.fr/upload/file/91762276263.pdf
    • http://pincailight.com/zk/UploadFile/file/2021090704184173499.pdf
    • http://marymo.ru/uploads/files/92324348801.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613480b8c5301---72035780880.pdf
    • http://md-servicios.com/userfiles/file/98592611457.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/34250842622.pdf
    • https://aldaserwis.pl/ckfinder/userfiles/files/nupijukevadonukilobudebed.pdf
    • http://okzawidow.pl/img/upload/files/19805698886.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=an+amorous+woman+of+tang+dynasty+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_off0000c99c.bin
79c202570b2bd097227a1024affe253981981d18afd92873963ddcb5d525e329		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC99C 11044 bytes
font_01_sfnt_off0000e339.bin
97d544bc511c9b97bb57479b37552ca39e10030c3eea2920b19d321e6ce5ea8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE339 20096 bytes
font_02_sfnt_off00011754.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 16792 bytes

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