Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b41668e49ca3a0…

MALICIOUS

PDF

77.2 KB Created: 2021-03-25 04:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04259f524ab61be2713061a8cbaa3788 SHA-1: 6666d9c330145c3afcfeb1c44ac99634e64226c7 SHA-256: 36b41668e49ca3a00a5b9ad60d654ecdca26532cd1c11a95bfd770424253226d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/aws?utm_term=how+to+calculate+control+transformer+rating
    • https://cdn.sqhk.co/xasakeza/gVLNgfl/rudibumilimesuro.pdf
    • https://cdn.sqhk.co/tekunipifob/jfghVZZ/fonts_copy_and_paste_bold.pdf
    • https://kegegofelev.weebly.com/uploads/1/3/2/6/132681159/jelukimatideso_kejopuzame_tidopureva.pdf
    • http://sadegegasiwa.iblogger.org/xewofilojunowizil.pdf
    • http://vibawukukar.iblogger.org/paixo_de_aluguel_dublado_utorrent.pdf
    • https://nodefosodetapa.weebly.com/uploads/1/3/5/9/135978328/morumuvir.pdf
    • https://cdn.sqhk.co/vifejoneses/hjjjYii/motibalexopamepunur.pdf
    • https://cdn.sqhk.co/wovovoteg/Jhegcif/nyan_cat_space_journey_game.pdf
    • https://cdn.sqhk.co/porodiwaten/GWgd8JF/temple_run_lost_jungle_game_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rodiligarexo/25423728635.pdf
    • https://s3.amazonaws.com/napejaxosinages/74806656434.pdf
    • https://s3.amazonaws.com/juwofuxufijup/what_is_the_diameter_of_a_30_30_bullet.pdf
    • https://s3.amazonaws.com/jutenojamega/what_are_the_covid_numbers_in_massachusetts.pdf
    • https://s3.amazonaws.com/lolijexejomak/49008822022.pdf
    • http://wenepebizitiwoz.rf.gd/nagizawegikagarenif.pdf
    • https://s3.amazonaws.com/nuruvapozixix/85549473917.pdf
    • https://s3.amazonaws.com/xulikamul/are_diehard_battery_any_good.pdf
    • https://s3.amazonaws.com/tikoweravisixu/ar_rahman_hits_in_kuttyweb.pdf
    • http://luzozizibaf.rf.gd/rubiaceae_family.pdf
    • https://s3.amazonaws.com/rogugagatuf/fomuzufidax.pdf
    • https://s3.amazonaws.com/gogoxowiniza/lajasepumov.pdf
    • https://s3.amazonaws.com/jolunenafobuw/gisulaxepod.pdf
    • https://s3.amazonaws.com/lepefi/vivitar_lawn_speakers_review.pdf
    • http://dobejul.epizy.com/14329415945.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed5.bin
c0cf8ac85cc21077d1830f8e05e44cd44c9980c55f72e953cb93e3aa33f224d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED5 5252 bytes
font_01_sfnt_off000100b1.bin
0eb68bbf0cb62bee1849369e6acec549e1d2a3dc23548e8dfef466d8339c71bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 11304 bytes

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