Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a43308d2c838ef…

MALICIOUS

PDF

72.7 KB Created: 2021-01-27 09:04:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 646123c745e3fd801ebf010a9a3a93fd SHA-1: 2e0fd3f549b15b29830109d48d9c88f9809cf070 SHA-256: 61a43308d2c838ef3dfac1c6f5ddafb363e55f55093928ab7ef511ff13dd83ff
184 Risk Score

Malware Insights

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

The PDF contains embedded links that are flagged as malicious redirectors, pointing to infrastructure designed to lure users to harmful sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URLs suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://cctraff.ru/wb?keyword=blue%20and%20orange%20balloons%20images In PDF document text
    • http://vovevowumusiki.iblogger.org/ruvaniki.pdfIn PDF document text
    • http://movoxazukum.22web.org/tixuwitapapuk.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/28df3b.pdfIn PDF document text
    • http://fepigubigi.iblogger.org/sika_epoxy_flooring_data_sheet.pdfIn PDF document text
    • http://pitupunum.iblogger.org/windows_movie_maker_tutorial.pdfIn PDF document text
    • http://korecos.ru/sijejasuwebiporuhsfab.pdfIn PDF document text
    • http://normaa-id.com/cyberflix_tv_apk_firestick6p88l.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/71183888375t01xn.pdfIn PDF document text
    • http://tidedejix.iblogger.org/dairy_cattle_breeds_and_their_characteristics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tobesonev.rf.gd/jased.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/antivirus_smadav_2019_gratis.pdfIn PDF document text
    • http://vaguwiraji.rf.gd/gray_s_anatomy_coloring_book_free.pdfIn PDF document text
    • http://tamexajifosu.epizy.com/24828106229.pdfIn PDF document text
    • http://dozonexupiwef.epizy.com/cg_new_dj_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/narulabux.pdfIn PDF document text
    • http://ruxuvejefo.epizy.com/animal_cell_diagram_blank_worksheets.pdfIn PDF document text
    • http://sanebofav.epizy.com/ap_calculus_ab_derivatives_test.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/solvency_ii_own_funds_guidelines.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 5336 bytes
SHA-256: b7a7186af23931e325dc793c195d6704b448c32076f41e5a12f7f9533686a6e6
font_01_sfnt_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 11024 bytes
SHA-256: 1ee2b83e32fc5ad4e7872ce7319a915f9cac44d040cce7c89538e7284846e4cb

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