Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aaf7218eb900f50…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 07:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a4885f79efb9dc0ee836729d7a4b75d SHA-1: 9817e10cd920be6f8cca92ad983ef11af89cf066 SHA-256: 2aaf7218eb900f50e8ae83cb0c8bd3518a535b2db00e2ff5e9daf826044c90d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://aesg2edcv.handylover.com/upload/files/48097483016.pdf In PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/tibowab.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/5013452226.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/98215195349.pdfIn PDF document text
    • http://chpcentre.com/files/file/dudobeti.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/kakanimamil.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/vuwugo.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/fukatitikepivenizuwewa.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109050257424487.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16138b4291200d---79591353433.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/kebuzun.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/71504357279.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/sajetatagavopa.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/87123204703.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/rijago.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/xemikepurerorowazu.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/zelalulanimupanofudira.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/77748142423.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/jumbfhae1s5t8u2pd1tb9i9qb0/31619059868.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/39204783983.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/83283086261.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/lonokar.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/wisolid.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/defegebitubi.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/74608359432.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/26007601383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=moba+legends+hackPDF 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_off0000d44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10584 bytes
SHA-256: 1ae3d896953c76bd51d95ae7d541a7a32488221361b28f54c380e08dc9b6365d
font_02_sfnt_off00010445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 17600 bytes
SHA-256: ad33d20d3f8f9ed1b6e75d764ecc0ca423b877de9cd28b99383f249760ebde0e