Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b99002939db849…

MALICIOUS

PDF

66.6 KB Created: 2021-03-02 09:05:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 843b3afc36ff87f38b2cb21e08b439fe SHA-1: 458887090d8de997965d98d49ec209ba84d9a149 SHA-256: d6b99002939db849631a14020a0adc607fc4ca5d4ec40a9d75c873935cb72ca7
182 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and identified as a link farm. Heuristics indicate these links lead to malicious redirector infrastructure, suggesting the document's purpose is to redirect users to phishing or malware sites. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9715

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://yafferge.ru/award?keyword=what+is+a+good+modem+for+centurylink In PDF document text
    • http://paksorond.xyz/calculating_weighted_average_life_in_excel1oq02.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/metro_2033_chapter_4_outpost_walkthrough.pdfIn PDF document text
    • https://lopatitegadusi.weebly.com/uploads/1/3/5/3/135311006/5583613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_60244b7b848e1.pdfIn PDF document text
    • https://xepekozodixati.weebly.com/uploads/1/3/5/3/135346226/3331357.pdfIn PDF document text
    • https://pugixodazujok.weebly.com/uploads/1/3/2/7/132710779/pumukuxamojosa-zadumunodavasu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_5fe764155fcce.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/firinuv.pdfIn PDF document text
    • http://tudorapitame.iblogger.org/79674365722.pdfIn PDF document text
    • http://raifaisentgo.online/alphabet_writing_worksheet_for_kindergarten1u4kz.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/kazivinijabot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/zaneget.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/inditex_zara_case_study_answers.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/47186832778.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/integrate_cos_x2.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 5616 bytes
SHA-256: 2b3830b04ab3587456c69774a7f2ab235fc7a678268552ec619ee1c15bb3017f