Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a1d8c4492f9d2f…

MALICIOUS

PDF

89.9 KB Created: 2021-09-24 04:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a569e9f18dfd55c9991476f1049da7b SHA-1: 4b2abbfa2c82f279c733db6ffbb874db84011b49 SHA-256: d0a1d8c4492f9d2f9c17baf05f69ab1a07052b8b35bad18b93bc6e82e5658d4b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains, strongly suggests a phishing or credential harvesting campaign. The ML classifier and ClamAV detection further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrabud.eu/fckpliki/file/fenazunamuvaserote.pdf In PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/35558336169.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/bedexomorose.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/45729027236.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/kovafunu.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/9799163534.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475dcc53f13---54077587524.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/genorimadilowolawili.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/jasagixuravokotuvu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-19/20210919200845394920.pdfIn PDF document text
    • http://kondicionery-bronnitsy.ru/upload_picture/file/3425752737.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/53075204335.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/21858354422.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_112855.pdfIn PDF document text
    • http://bulmarconsult.com/files/baxofetifijakonipeve.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/bumopesasatezukugon.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/zezimujatufomaz.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/26686008633.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/92265974622.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/1662036262.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/5316654115.pdfIn PDF document text
    • http://ijfbn.com/editor_up/xolijutedubuwaxaniz.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/zopulodogemakolitaw.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/winisaxegosujexipetemubu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/10634293149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=online+watch+movies+2020PDF 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_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 17596 bytes
SHA-256: 2a586e15842c6702ca15a1a1c67d8e248567d8cb9b4ef03c625741e1233dcbea
font_01_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001410a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410A 10816 bytes
SHA-256: 604568eeeb9db02d067c9dadf6e92c6bb02c6209275341a704d995a21e1ba249