Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f646a13bdf0c9bf…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 13:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31b835266d5cc1c01371398e35b9e93d SHA-1: 99cab0f6e652b9d0ccf005c8bad94847d0877abd SHA-256: 1f646a13bdf0c9bf1feb0a9888fb0d69ab8449ae94e59fcd21285ea3cdc31fe3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains or files, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://excellencetogether.com/img/files/file/23076563271.pdf
    • http://humansharehouse.com/userData/board/file/mufadarawuvemomavakuko.pdf
    • https://penzion-palice.cz/content/gavisevowebozenit.pdf
    • https://tonymusic.se/UserFiles/files/fopobonoxutolorola.pdf
    • http://sevvalturizm.com/rsm/files/porisoju.pdf
    • https://semineebrasov.ro/printuri-fi/files/53797491359.pdf
    • https://susta.vn/userfiles/file/39713956749.pdf
    • https://libertyrealestate.in/ckfinder/userfiles/files/56435525944.pdf
    • http://daivupaint.com/img-chamthi/files/32118821477.pdf
    • http://adice-area.com/pictures/files/rukezirezidagewituk.pdf
    • http://e-hematologica.com/users/file/lakudab.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a93d3d731e---58477371070.pdf
    • https://aromamarketing.md/img/files/bedozunovumakevofukalixik.pdf
    • http://mitcostruttori.it/userfiles/files/3548928988.pdf
    • http://iwayman.com/uploadfiles/file/210919051122838833g1dvvv.pdf
    • https://imaggu.com/ci/userfiles/files/mowisezunokokewogolazafav.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9179b526d---xasasidotebosuxi.pdf
    • https://holocaustresearch.pl/nowy/photo/file/72042560149.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/sozoxa.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/gejaluzedowopanakam.pdf
    • http://arabstina.com/ckfinder/userfiles/files/64002091698.pdf
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/32897154277.pdf
    • http://unicaconsultoriarh.com/images/files/5523062787.pdf
    • http://meteoratourismactivities.com/files/files/17573540283.pdf
    • https://skyzoan.com/cake/beta/userfiles/file/86097312831.pdf
    • https://kidneystonetreatment.in/userfiles/files/50816066729.pdf
    • https://gbp.dropship-online.com/userfiles/files/5689881028.pdf
    • http://quesnelbusinessnetwork.ca/userfiles/file/ribibowibemedi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hollywood+full+movie+online+play
    • 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_off0000e4be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 16792 bytes
font_01_sfnt_off0000fcd0.bin
e7db64a62b8d3d6d1e90eb03ecf6851dabe81f45aa9fabfccb9b8f2c7ef6a92b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 17240 bytes
font_02_sfnt_off00012978.bin
4085e19fafac19ec2bff4863e5e00ee5f723977c289b96e2f8abd78af8a8479f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 10648 bytes

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