Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b5f7a8e0fb1c8e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 00:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 666db793d84a1c96363718940ec9db5b SHA-1: f9398ecdc33baeda3935e54d0c7ffaf40d4d6c44 SHA-256: 77b5f7a8e0fb1c8e668ae29a829de0999bc0e0f9582ebccf9b35a6a97e392930
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or phish for credentials. No scripts were extracted, but the presence of embedded URLs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://6nergy.fr/6nergy/sites/default/user/file/wivufopogazewibidukokudex.pdf In PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/lajalepaw.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/61188771119.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/wapiwalinonosir.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/a6272750cbd3f60cf20d50244edbc7f8/35418594050.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/wosilanenavasogujonunif.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/17852678619.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/tugijepegofegezokokepuru.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/64428300190.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/34683754089.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161341a9f1cfc3---5581799919.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/xixatemerufofubeja.pdfIn PDF document text
    • http://saaretravel.ee/images/file/libopewimijaraxibinif.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/tujebiteripekevutog.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/nunorofedezajal.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/56120091162.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/popidawarobas.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/fefoluxuroxovel.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6d0f4acb21ba94739c617530c4a4cbef/keroboxevixinelu.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/wifujelekup.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/wuxirafepiraja.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/5587712387.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/97331945379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pou+mod+apk+unlimited+coins+and+max+level+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_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 11024 bytes
SHA-256: 1c55939d83df3d54643ef26d4d9ec1cca455976ccb3942bae739851a4cbbb9c6
font_01_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 18420 bytes
SHA-256: 42a22074c0e916bcb17bddb6c7392d0f61a3efc600deb17b50d773051566015b
font_02_sfnt_off000127bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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