Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ac370e39285692…

MALICIOUS

PDF

103.2 KB Created: 2021-10-06 21:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 195b6ce9445e0e892e3b6dbf3f1b1e71 SHA-1: 69110e10b0bde66b18111f2bc53b31619e8c7c0e SHA-256: 28ac370e3928569217be5ebd05a8511ee1d52b51d88e2402481a9b18821984d4
134 Risk Score

Malware Insights

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

The sample is a PDF file containing embedded JavaScript, which is a common technique for initiating malicious actions. The JavaScript likely redirects the user to external URLs such as 'https://infrive.ru/uplcv?utm_term=mitochondria+have+their+own+dna', indicating a phishing or malware delivery attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=mitochondria+have+their+own+dna PDF link annotation
    • https://daks-96.com/f/uploads/files/60588020124.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/pibidavifelepixa.pdfIn PDF document text
    • http://rld-carbon.ru/file/71406835414.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/lizaxozapozi.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/tinawigupiput.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210924132022_ui31bu.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/pijet.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/4630048030.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/nopubesipi.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/gokogaxiwotubirubejuxu.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/46990785433.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/97295732281.pdfIn PDF document text
    • https://rajaunited.com/contents/files/davozojubijolixepoxil.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/26730253797.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/mavotanegesujoli.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe29cb064c---716026471.pdfIn PDF document text
    • http://metroboxservices.com/upload/ckimage/files/puritekedibujur.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/46748831540.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3dc21821fcb21d47824e6d0df0cb56bc/tisewanumurofidulejezema.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/23609211778.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/petewusipafivazas.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/29100082629.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/48552137229.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_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000142d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D8 20384 bytes
SHA-256: e67f855be7d35f1da59c472bec4f29937249b16fec7a71f2e1c7172ac1b214d2
font_02_sfnt_off000177f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F4 10396 bytes
SHA-256: 3261cf150335597022811b7566663dbb2cf0cbe0f1a4d9ef7f70c304784bf8de

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