Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ec3ab63f265411…

MALICIOUS

PDF

82.8 KB Created: 2021-05-08 05:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 83de2552102a9b911410cd1ad063b42c SHA-1: e7ac2cdc4cf7dec413120d283fb7ce2be561fca3 SHA-256: b7ec3ab63f2654116eb1610b6a4a6e747f704dd119220907f074b960a27734ad
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=the+power+of+love+movie+2013 In PDF document text
    • https://xofuvavafifibib.weebly.com/uploads/1/3/4/3/134386759/492413.pdfIn PDF document text
    • https://lokizidaputanex.weebly.com/uploads/1/3/2/6/132680869/xojabozezoz.pdfIn PDF document text
    • http://copyrightram.net/divunirogotuneq6jhz.pdfIn PDF document text
    • http://strahauto.website/1842271214p38mg.pdfIn PDF document text
    • https://cdn.sqhk.co/fegokirar/hGidEgc/70505702378.pdfIn PDF document text
    • http://jovalevuwalu.22web.org/como_baixar_livros_gratis.pdfIn PDF document text
    • https://zepudelewow.weebly.com/uploads/1/3/2/6/132682561/7680969.pdfIn PDF document text
    • https://cdn.sqhk.co/pabulibig/Nie9Iji/repinunorapimufekexi.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/kodejipaju-mimafemabajenev.pdfIn PDF document text
    • http://bezprovodov.guru/23245701214uwp5x.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafixap/jijejbg/ableton_manual_printed.pdfIn PDF document text
    • http://coins24h.com/how_to_type_cubed_in_google_docsadicc.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/sixabirirer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_80c71e0395bc4db0aca2f450fd2418d7.pdf?index=trueIn PDF document text
    • https://cc603790-e41b-456e-9848-d053b607cad6.filesusr.com/ugd/389793_ced1a8960625449b98c5fb4ab618997f.pdf?index=trueIn PDF document text
    • http://niwuganol.epizy.com/vba_select_all_cells_in_active_sheet.pdfIn PDF document text
    • http://zoxutudirufusoj.epizy.com/97405357923.pdfIn PDF document text
    • http://fobupozomorefiw.epizy.com/fulibuwuxila.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 4948 bytes
SHA-256: 4cfcd69d3d7461defdd987dedf5af18f1e8b1337f2570077ea1eef0a88355205
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 10460 bytes
SHA-256: 2c172e6e034d048460ba03ee0499b6aeb5e1ad240e1b256c51ade5be467af86f
font_02_sfnt_off00012fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34