Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d283d8eadb7ac9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 07:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95ddaeeeb8aef13a887a92dce516b3a0 SHA-1: 253c11e094615ff62ab5c16b225522041824d0a0 SHA-256: a8d283d8eadb7ac9ec6c6017cc2390ee1c2c2e8861fb83180b3b5aed5ad1a105
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The numerous external URLs, many pointing to PDF files, suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/27338605536.pdf In PDF document text
    • http://3dtechgroup.com/uploads/image/files/nafokovagexigilun.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/83976364828.pdfIn PDF document text
    • https://izometal.net/mm/file/84514197512.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbb6d11032---dexasinuparetojim.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/luweru.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/64593400232.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/vexinariwefopafixe.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210913234352_l36xkn.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/63317404138.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/85108872040.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f05a987818---56897241220.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/kelewunoluw.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/4285498251.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/72620015531.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/96906690684.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/65227782940.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/xonovevuvejikusuxif.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/73487854072.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081756379895.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/xotutaf.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/wuvukusonogoz.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/laruxatowi.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/buwemegux.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/57508129561.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/55022054049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+action+multiplayer+games+for+androidPDF 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_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 17504 bytes
SHA-256: 5d139add213833c65e4001884fdd5dd5ee933242dcc8c08cb88ceb64b93de771
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC3 11232 bytes
SHA-256: 94eb8285b69cb0d58859223c213af1b8d38b2c04d0a6afa196f70fc50a054f47