Malicious PDF — malware analysis report

Static analysis result for SHA-256 878cdf2835575648…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 21:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6fc4e707852a7568b6e1b2dfe4eedc34 SHA-1: a1f6358c7939397f8c68ca62786b8b6394f73d48 SHA-256: 878cdf2835575648a3b2749dc247bcb3ab099c0efbf81f59bb100aca1d2f658f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52274012752.pdf In PDF document text
    • http://pobierzplik.pl/uploads/files/53041503683.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/dirur.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fufenugorikilulitesenig.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/radezaku.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021091403453616.pdfIn PDF document text
    • https://noventa.cz/media/files/file/paxafibadunugazuvutowagav.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/rezawusifamoneti.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/1684860060.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/60981832053.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/88993035272.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/rofexodakemowadok.pdfIn PDF document text
    • http://nktrading.qa/file/files/geledimeresugazuzakutofed.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/58597163181.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/tonomikoxizevosudi.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/67556456414.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/bukufexavefixon.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/refojigasum.pdfIn PDF document text
    • http://vucert.vn/uploads/files/tukokudag.pdfIn PDF document text
    • http://forti.in/userfiles/file/18925313249.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/wopuzekakotasumixunonosa.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/28995207480.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/12131848020.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4cc9a4e24---vitita.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a93e7c89f---60140753181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=around+the+world+in+80+days+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 11204 bytes
SHA-256: 269ca244b8216cb2b186598972c06463efcdae618ada45c29f9a2117dd3b0564
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 17580 bytes
SHA-256: c11deadf41a2c848b1071f1f8c01ea090f7af98908662540cd02d82b74d3e937
font_02_sfnt_off00012bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1