Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36b2176783139ea…

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 17:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: df5f855f34a0b70998b8d03c225888f5 SHA-1: 87efee7904febe701cfa5509da82d6dcec77107b SHA-256: b36b2176783139ea5e2b4b460322b34c2be9c8af94ea55d028bce6df980101da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://inwebjor.ru/uplcv?utm_term=hallo+speak+english+with+natives+apk PDF link annotation
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/38700844155.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/nogevenajol.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/5702595984.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6140762879320.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/79065381109.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/pezotejerosomojodepa.pdfIn PDF document text
    • http://hkalc.com/userfiles/7921349595.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/nifewopikubilowugatow.pdfIn PDF document text
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/gofezujakafu.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/keladumizalebu.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/32649526648.pdfIn PDF document text
    • http://congtyvima.com/images/Download/zagorelelalodu.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109221846245383.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/sotep.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/50928064625.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/fejozoviniwu.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/43880251409.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/xatatomoporaje.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/72162856784.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/58642711121.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/67949785195.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/sidalesupazimelalafa.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_off0000e626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE626 18532 bytes
SHA-256: 41a548c6accdacb3ae73b820424be66d137b37f2d5579b04dc2128dd6d4978a2
font_01_sfnt_off000116e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 10664 bytes
SHA-256: e795a8706e8745ba4a2f0a0731f71801b1737f5c9c2ac12f84cb8d6127c4f668
font_02_sfnt_off00012f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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