Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47af7b2859e9378…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 23:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e8bc3504c804f88046a0cb0747114a9 SHA-1: 771bbdac4d3d1f78d2ba60fe375f651a2b20bd40 SHA-256: f47af7b2859e9378a6ddf3c75fd0f735921e854083eaa1ca8693eaa344ffdf0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown reputation URLs suggest a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kabelkyaobuv.sk/editor_uploads/files/lofunitobinetutezeketuro.pdf In PDF document text
    • http://www.logomarcanet.com/userfiles/file/babelizosenede.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/44644362427.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210907145535.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/wetakuxalik.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/kaseba.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/jekogovapes.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/ruruniverapixi.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/lagat.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/49969910567.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/739838897.pdfIn PDF document text
    • http://demkapi.com/resimler/files/13946892050.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/fojedapotonopanexo.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109101338054137.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/52721533768.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/mububizon.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/21130218946.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/97426805945.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210904_113502.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/purafenuxepapakebogexor.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/vovixojonagopak.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/73594199007.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/61870511440.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109072028344587.pdfIn PDF document text
    • https://gencatakan.com/upload/file/55691896260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=redeem+codes+for+robux+2020PDF 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_off0000d568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 17704 bytes
SHA-256: 1d1c36bea77dbc72202c6e6846b13982ca71fdb95d1f4c22f63a24ee3718634b
font_02_sfnt_off00011b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5A 10764 bytes
SHA-256: 436446a2a96e010bcefa49c51f7b591ac857c2fcb51a9429e80376b4a739599a

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