Malicious PDF — malware analysis report

Static analysis result for SHA-256 190f551c5d27e0b5…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 21:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4bde32997fb16191080ff4fb35f6894 SHA-1: 1ba1273bfd88b8796f08815c7fb84b6f52a72f34 SHA-256: 190f551c5d27e0b5adb3486779bb51de1d871cc57f7bf009eb4ec63ca25cf9b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's designed to redirect users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://vasantviharproperties.com/userfiles/file/60797170218.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/c96a24ed03ed2b2850f723a1e2f4c55e/tinewizejopuzubokebudesum.pdf
    • http://studio70.eu/userfiles/files/39046956077.pdf
    • http://gdwtechnology.com/fckeditor/file/debev.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/1078792660.pdf
    • http://noithattamphuong.com/upload/files/figejo.pdf
    • http://rovitek.com/userfiles/file/mulibobobojejutazaf.pdf
    • https://ambient-interier.cz/files/files/sezugex.pdf
    • http://hondaotohaiphong.vn/upload/files/zejetepinan.pdf
    • http://www.jfac.kr/ckfinder/userfiles/files/48050686564.pdf
    • http://ljjxmining.com/uploadfile/file///2021091217453065.pdf
    • https://veneziashowroom.ro/app/webroot/files/userfiles/files/40463116032.pdf
    • http://marymo.ru/uploads/files/vebuv.pdf
    • http://patriabrno.cz/userfiles/files/dewubobuwulutudetigevij.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/71257188254.pdf
    • http://mydreamtuscanwedding.com/editor_up/totasafukobufijofil.pdf
    • http://gtlfuelmarine.com/userfiles/file/tekataralamax.pdf
    • http://bbmeti.it/userfiles/files/kejij.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb1edf1eb---62745130934.pdf
    • http://cancunday.com/travela/img/files/libibimenusuzeligeselik.pdf
    • http://koala-al.com/d/files/58142145133.pdf
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/24743416586.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/tetowositetinuzokejumijad.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/virokera.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sims+freeplay+iphone+cheats+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c705.bin
1baffc411a0a13c1549d2072999a32c4da0af47d3592ba66736ebeb2f17c4a82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC705 11176 bytes
font_01_sfnt_off0000e101.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 16792 bytes
font_02_sfnt_off0000f913.bin
284c8314505469b06a660776336b0576caca70030607ce88814d006b100e1a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 17580 bytes
font_03_sfnt_off000126dc.bin
9bd840e38ca724e0f7add454c8dc7fb71ec8708ddb0d9b64c91e59f29ffb0f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126DC 17828 bytes

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