Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4979be36803c742…

MALICIOUS

PDF

72.9 KB Created: 2021-10-02 01:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 39f83046fddf2bf288736e5e5640f762 SHA-1: b560153a4bfd50fed6303b09f9c8a58394bc8bc1 SHA-256: d4979be36803c7421a89eece3f657e5e7150e2e5bca3781e97ed482817925a2d
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious. It contains a large number of embedded URIs, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to lead the user to malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 4

  • 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://allytemp.ru/uplcv?utm_term=bingo+mod+apk+2020 PDF link annotation
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/xavafofopalifulemakow.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/kobileriz.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/40907079144.pdfIn PDF document text
    • https://campermagazine.tv/public/file/37689038612.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/wawavozexevu.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/29123416184.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614285ace1de7---wifarateseka.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/madotuz.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/1086714532.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/dizisajupuzusapim.pdfIn PDF document text
    • http://princeverma.in/uploads/files/83827719252.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/mufazenetoledebaso.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/duvape.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/96265120559.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/37173524444.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/10562729427.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/zubub.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/rugidekibaturi.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/muwewudabowewuw.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/ditasanif.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/bewemidejo.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/nafolox.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/memalamabujafelob.pdfIn PDF document text
    • https://huanghecables.com/d/files/rolerikokavubegufuvi.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/wifisulebid.pdfIn PDF document text
    • 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_off0000b489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB489 10580 bytes
SHA-256: 90e6a3a7e0feb6055e4ce614c650a91f3dca2dc6f6d6daeb8815cf4d486aaaa4
font_01_sfnt_off0000cc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 19252 bytes
SHA-256: 991ecbe1d4d3d7f97664ff2360b198e89a0a9c884965edda26096483e6b1e235