Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a18d05ff977861…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 23:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 072af9485043125b15c95c0774526f16 SHA-1: 3b094354c4ce1243b6150c484052caf8bfdbefe6 SHA-256: a7a18d05ff9778615dcc57db5e25a3e46385f47c2162606010f7983f47db2ae3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript, though not fully detailed, further supports the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=338+square+root PDF link annotation
    • http://lyzjkgm.com/d/files/17579242698.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/38488446077.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22815983670.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/madiliwiporenajoxosumo.pdfIn PDF document text
    • http://unseretochter.ch/images/file/51203100421.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/40512561504.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/kufak.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/kebigikabob.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/tafiradejitukukulaledepo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903124813582.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210921160529903304.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/51149791459.pdfIn PDF document text
    • http://pi-consulting.ch/download/61642540292.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/pupitujegajopawun.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/winurexu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c10bed51---todidawedimuba.pdfIn PDF document text
    • http://orthodoxnews.us/file/ralilavalagufipas.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/nofujobajuluwoxazeterew.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/zumuxevul.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/gotumuxoguvifekadixujazi.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/59035150679.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/wimizu.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/denatidokalasifuxojutuvef.pdfIn PDF document text
    • http://builderall.info/userfiles/file/wukamajizenavafolanizurus.pdfIn PDF document text
    • 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_off0000b2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CC 17772 bytes
SHA-256: d30c700825ef2fbe0e7d55f6c39792c6958a7cc17b40ceb93dea9791f628da08
font_01_sfnt_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10388 bytes
SHA-256: bf1b48bbce7b44e1425d566fed438cb14b9da39fc81f283b113b98e0600dfd97

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