Malicious PDF — malware analysis report

Static analysis result for SHA-256 034856badfb630bd…

MALICIOUS

PDF

82.4 KB Created: 2021-09-15 09:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 52f093cb9426a6ca7f1cead37fa47198 SHA-1: 5c792a59eea6f807d551097fe143e4f5c9f3c592 SHA-256: 034856badfb630bd90f817f43fe0f78ebc66a3f0ffea2b297ef1d9ab7a350cde
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming campaign. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=pisanie+sms+z+komputera+android PDF link annotation
    • http://tv-sat.cz/userfiles/file/55808460738.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tudavige.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/61304365068.pdfIn PDF document text
    • https://citytrafik.nu/images/file/92016687613.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/borudazozinasafifanoku.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/mopebezalix.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3c6a6f7c61af7477aaa5e2136991ab97/zikijewelafugunajusa.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/30756979792.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/33069578011.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/doresezoposagovufotepejo.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210904073845.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/33194027026.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/1987590344.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/83239658629.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/rokufojevepenoperofiripak.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/nixafazuk.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/botulezibikok.pdfIn PDF document text
    • https://casaalu.com/luutru/files/tipetokujanufuvobike.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/dijojidesunivafiwifaribev.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/94826633589.pdfIn PDF document text
    • http://bscartridge.com/pic/9090116006.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/21004740751.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/wezimobemubuvorafobifer.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/89566593867.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_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 18136 bytes
SHA-256: ad23664f8075450b04646fdfd850526c569428c2b639545b22937dad5b7b3c18
font_01_sfnt_off0001095b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12172 10760 bytes
SHA-256: 575398f966ba371376c9cea6abb98cde7540694c7af8891456337fb36bdb7288

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