Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a86c63e2749fe3…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 13:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 914aae8c0e5b2c7227bf3b73a8db1ed4 SHA-1: 110652ea7f5450828a70141ed10cc460144361d0 SHA-256: 07a86c63e2749fe35fb181d550ddf20d7c887f83abed8b1e270c128439915c6c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external URIs, many hosted on disposable domains, indicating a link farm designed for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to credential harvesting sites or further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://uclerbaklava.com/resources/file/redemifurunabawizo.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/fopowifasikakaxutitij.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/16134072668.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/25b46c0b4ec837fc8b51179f536ba4ee/pilisobozirubunulivunesun.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/34095710351.pdf
    • https://artlabjo.com/userfiles/file/bopilinopogaxaz.pdf
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/52651382897.pdf
    • http://dtmaso.com/public_html/Imagens/file/jutimilidefe.pdf
    • http://achilleferolla.it/userfiles/files/77822621667.pdf
    • http://micruts.org/userfiles/file/kiloxugokixutanugitir.pdf
    • http://wajl.net/img/file/202198115658.pdf
    • http://ylphs.com/ckfinder/userfiles/files/5663489753.pdf
    • http://itagqatar.zajeltel.com/itag/file/files/1707652695.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe22b18c3---7603611070.pdf
    • http://rootbeadmill.com/upload_fck/file/2021-9-8/20210908064731250408.pdf
    • http://www.facyt.com.ar/ckfinder/userfiles/files/49219593132.pdf
    • http://spbi.cz/res/file/85776134316.pdf
    • https://hantverkarenisandby.se/UserFiles/files/sokosepure.pdf
    • http://fratellilongoni.com/userfiles/files/menawip.pdf
    • http://munnarteabungalows.com/userfiles/file/guposove.pdf
    • https://torgradio.ru/new/files/file/dezis.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/44697607948.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/pufigero.pdf
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/dovujadetirudujufolid.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/mutelimofadesalipanu.pdf
    • http://tinhdauvietnam.vn/upload/files/50054779726.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/ruvekikejizezod.pdf
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/vomipewoleweni.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+change+password+on+android+email
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d547.bin
04586923c5203b4c06dcbb5414b722e388569fa58c80e58418a8c155e75ce080
pdf-font-stream PDF embedded font (sfnt) at offset 0xD547 11036 bytes
font_01_sfnt_off0000ee93.bin
583c56c4a11ef63846b417c2cbc02d3836d2a34661bcb71fe76d5c3f33ecf44f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 17180 bytes
font_02_sfnt_off00011adf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 16792 bytes