Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f84dc39f4044b1…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 03:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 976840cc39348533c560bc7c3f531348 SHA-1: 9f21bd57d70a69c66e34ca4a9feff033e3ae5170 SHA-256: 91f84dc39f4044b1bdfb8a0a43df62943345c39878b824dce731dfcc20e3ae05
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://vilenefex.ru/award?keyword=past+present+and+future+tense+practice+pdf', suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious intent, likely involving redirection to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=past+present+and+future+tense+practice+pdf
    • http://lumobumekola.getenjoyment.net/archinteriors_47.pdf
    • http://miwewumexurigan.sportsontheweb.net/4645127294.pdf
    • https://cdn-cms.f-static.net/uploads/4491686/normal_6015e8ee6bfe2.pdf
    • https://static.s123-cdn-static.com/uploads/4448343/normal_5febd06581a60.pdf
    • https://cdn.sqhk.co/ribegibonot/5rihiLE/ghostrunner_ps4_pre_order.pdf
    • http://rinobozawizuvew.iblogger.org/jp_3_12_r_cyberspace_operations.pdf
    • http://tozofuji.scienceontheweb.net/animal_alphabet_flashcards_printable.pdf
    • https://cdn.sqhk.co/tivuzofep/TE1Dgfm/gogajasotowijefaz.pdf
    • http://fomoregekamikat.mypressonline.com/gaketoxa.pdf
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5ff75607dffbb.pdf
    • https://cdn-cms.f-static.net/uploads/4403121/normal_604d7ffb9ee76.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xiwexuxe.atwebpages.com/asia_map_2020.pdf
    • http://mevedokepovi.epizy.com/ruzelig.pdf
    • https://s3.amazonaws.com/novipaliwid/zogus.pdf
    • https://s3.amazonaws.com/lupebesu/my_talking_angela_uptodown.pdf
    • https://54e283d8-6946-47af-b6e3-c78582312647.filesusr.com/ugd/22cd47_5e36b81e5f7145ad81100c2c6c5b0c57.pdf?index=true
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_f18a95ba1678492485f2d984bc401c7d.pdf?index=true
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_5e798c4c29164c518fc3e0215c0751e8.pdf?index=true
    • http://kukejisagev.epizy.com/lupixizeletevarinij.pdf
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_25b06dbbdaa24d56bd94a8fe57ae56f2.pdf?index=true
    • https://s3.amazonaws.com/zedilegol/bhagavad_gita_english_commentary.pdf
    • https://s3.amazonaws.com/timituvupame/karuxukugima.pdf
    • https://s3.amazonaws.com/towutoginadivu/66009036245.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daad.bin
0a1e93666dd74b6ea1cd17fb2ccb28eca51c268bccb366f550860b2808256b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 5116 bytes
font_01_sfnt_off0000ec27.bin
3bd4b7c247c09be90bb13fc564a9ad9bcd8d42519f5b2b74838bc4f352de9476		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 10936 bytes
font_02_sfnt_off000111a1.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111A1 16204 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.