Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9426ed582ca889…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 02:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77ba11087cf3552c07db5e09c081d11e SHA-1: d283dbe26c3fdfc927e1ae6307c16eb6d3a67427 SHA-256: 8d9426ed582ca889155cd68c47438de65510be74c095920737cc92946d78fa2f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to external resources, suggesting a phishing or redirection attempt. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pepinieres-soupe.com/userfiles/file/waweritedet.pdf In PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/lubenurazaxiwotofuget.pdfIn PDF document text
    • http://whatdwellswithin.com/file/nulonuvevimibu.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/41430706166.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/kobofu.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-09-08-04-30-30-SQeg5XVg.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138abf18eeab---84932624273.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/24530349039.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/levazi.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/xavujeren.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/18486295758.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/1490930186.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/18330249663.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/jokemibemarosekujese.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161392aaaa2173---nemoguk.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/kupap.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/99085395820.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/36338159415.pdfIn PDF document text
    • http://gojjang.com/uploads/files/nadoroxo.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/86007223198.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/tidagalujujamudupad.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/75314962348.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/33839503775.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/71531674501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cartoon+themes+for+androidPDF 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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD31 16664 bytes
SHA-256: b827d0f2c9bcfe641ddf6b3eccf6d100a34b0e5b8db60e401102bf7804f2d233
font_02_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 10604 bytes
SHA-256: 0586200b3941eb2e2897c2bee959757c73b1521480f506604acc10a49872e2fe