Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f79aa82d696e493…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 23:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60c9c373a5b606f304512277a8421d5f SHA-1: da5384fa39a08b06b89cab18cbb8976c1ade6070 SHA-256: 1f79aa82d696e493c0c3e29907a778b886342e09070084fe7651f8eae4a732d6
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured to host numerous links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://quranday.org/userfiles/file/99232143843.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361b8f69649---furov.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/48441459762.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jijujurenarizurif.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/vumuzidodepez.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/11985278478.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/lbkhtbd6authvsvmmkbutatlu3/53842682228.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/sumagizunimarox.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/91205188814.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/61223005654.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/53407417252.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/91450633049.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/82862860965.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210906_135135.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xudekisuretinoruwod.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/gusuvituz.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/38225873785.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/rerarola.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/88146001962.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/nolajugivor.pdfIn PDF document text
    • http://schokofontaenen.de/idata/nidiwukijonakalavu.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/88969815385.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/jukijegifalaraza.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/pidaporere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=skip+verification+file+for+forza+horizon+4PDF 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_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10780 bytes
SHA-256: d21b3c0ca93b468bd7076c4d3b034a051cd0b5f3316c5c107fdab6eca863dfa9
font_02_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 18172 bytes
SHA-256: b39128b6ce8855d21d461c5a7697e799d2a2abcb0258cdb200e79a07658047b6