Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7565289aa2a4aa1…

MALICIOUS

PDF

87.4 KB Created: 2021-09-20 12:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4862459289a8b2ac714338fd6baaf225 SHA-1: 2a8b8ea67c15bdb6d1dde0ace5a2f4e1a0e12b87 SHA-256: d7565289aa2a4aa16676a9a8b3161c90d00179a3bb9a292e6abc881b883af2d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links pointing to a link farm, a common tactic for phishing or distributing further malware. The presence of a disposable link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://allgeology.ru/ckfinder/userfiles/files/87196181629.pdf In PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/gumafezom.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/923038517.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/janotafan.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/fetojuvatakeda.pdfIn PDF document text
    • https://computerzone.pk/file/guwano.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/44709594361.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xunopugofebo.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/xivadepowinekab.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/40285399445.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/tibudipujutivimokux.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/lelafakojegenuzawedeja.pdfIn PDF document text
    • http://holzbau-napetschnig.at/ketakulivafefexosukimutip.pdfIn PDF document text
    • http://wamer.org/userfiles/file/23344357284.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/64799782934.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/fazabujenid.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/dibonelatudarozubisatipom.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/2109181123230496840flic.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/mimedim.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/lugulowu.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/89305412401.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613905f71af9e---saborunewibavubitixakoz.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/74416686947.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/kuxuvigugen.pdfIn PDF document text
    • http://all-premium.com/user_file/files/43805880317.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cookie+clicker+prestige+upgradesPDF 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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 20172 bytes
SHA-256: e152639df557dd9fa09558a15639ed4d5b3ffff192af79ff86a93cc83a2f5b5d
font_02_sfnt_off00013685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13685 10808 bytes
SHA-256: 9f21b331cfd25f020ab9f7da273efb1eb57e05a01186fdf1d460c0a1ebcc75f6

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