Malicious PDF — malware analysis report

Static analysis result for SHA-256 3503ed93d9d5cc8b…

MALICIOUS

PDF

136.1 KB Created: 2021-03-16 15:50:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9c489d2dd89f8c4949de0b4a1cd877a0 SHA-1: d51c9ed532dfa2e6021ccd98d1e7908f4354ee53 SHA-256: 3503ed93d9d5cc8b50ab30dd864f575727a19caccc67d58838989d25c5defe72
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://xezojetit.ru/wix?keyword=samsung+sm-b311v+manual PDF link annotation
    • https://lamonide.weebly.com/uploads/1/3/4/0/134096931/000cc78.pdfIn PDF document text
    • http://trixy-matrix.space/holmes_oil_heater_recall0k1ci.pdfIn PDF document text
    • https://roribevewo.weebly.com/uploads/1/3/4/5/134502196/7db7ce.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/bobirunozotisizuli.pdfIn PDF document text
    • http://mebelintera.ru/ada_o_el_ardor_free56fzt.pdfIn PDF document text
    • https://betebawaxudu.weebly.com/uploads/1/3/5/3/135388356/eebba576fac92.pdfIn PDF document text
    • http://wawewifebobojum.22web.org/vademecum_auriculoterapia_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/eXzGIND/wwii_air_combat_3d_simulator.pdfIn PDF document text
    • http://penerete.66ghz.com/confidential_statement_on_fax_cover_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/nunagike/Zjeibgc/risk_issue_action_decision_log_template.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/8gfvYhb/73601243352.pdfIn PDF document text
    • http://stat-index-co.com/85232225043dgb20.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/bGhgicu/69228234527.pdfIn PDF document text
    • https://loloxemevo.weebly.com/uploads/1/3/0/7/130739498/rexokapexolux-jowamokak-rejevujaleriw.pdfIn PDF document text
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/jefosebugudi.pdfIn PDF document text
    • https://jufasoxoko.weebly.com/uploads/1/3/5/3/135315704/290ee59b.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/PTOVhjr/ytd_video_er_for_macbook_air.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nebokidib.epizy.com/ethiopian_movie_free.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7DB 1768 bytes
SHA-256: 4fe1f96ba8db5cf35ca47cddaf067669eaebb9c038fc61eabfa1f5836d0fc525
font_01_sfnt_off0001c081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C081 5460 bytes
SHA-256: 56c49533fd2460dc85a807422e3c25c668dfbded8de1fd006454cd219016e5e3
font_02_sfnt_off0001d318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D318 12600 bytes
SHA-256: 3eb59938b3b04150ba16e7169c0a6430eab23d08709df454e4697e5392e8931f
font_03_sfnt_off0001fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD64 16084 bytes
SHA-256: e5245523bd71a78e06ca3300da63f55ad096e28dd8c1a5e83e138be64f7d0aee