Malicious PDF — malware analysis report

Static analysis result for SHA-256 24496aae40fbe934…

MALICIOUS

PDF

88.5 KB Created: 2021-09-16 02:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72c74d14bf776294be4b2d5fe0358223 SHA-1: 39d5f1e286bf08971c151cb48551bfec9dac207f SHA-256: 24496aae40fbe934251836340562b5565b2a1ed467e1f2a5ffac510646baff78
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users to download potentially harmful files. The ML classifier and ClamAV detection strongly support this assessment. The primary lure appears to be a fake APK download, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=unlockmytv+apk+download+for+android+phone PDF link annotation
    • http://aviapartner.biz/js/ckfinder/userfiles/files/judosilaroninonisu.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/64112353798.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/9664403990.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/mojugutimomusasewapopixex.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/22234647561.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///bipex.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/rirexegowuxigixu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134a88ba7c35---tizibam.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f94eabb9c---dufusireganewiv.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/gewex.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/84821930245.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/milatowatipojo.pdfIn PDF document text
    • http://sdes.in/uploads/62683443506.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/mojozurulovifaxolodusim.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/voloxosilonufinakoke.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/22519932818.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/71433236268.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/11034669349.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/24486438780.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/wawasijejavubunirob.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/97818118431.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/3705105610.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/62622791682.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/xokelezekoponabebemumuze.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/58609303718.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/98691300016.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_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 19116 bytes
SHA-256: de776c3c7c786b503067b24e8cbe925ee7c6304deaf6eea22d50cad6f87f4435
font_01_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 11080 bytes
SHA-256: 9bb431821f51189b05a7e8531887c3edc9f6fff27dd22b2ffef861fe2ce277c0
font_02_sfnt_off00013c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1