Malicious PDF — malware analysis report

Static analysis result for SHA-256 939ebcfd31ab16bf…

MALICIOUS

PDF

75.5 KB Created: 2021-02-20 11:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a1f93f3bb1e1b68881b96a323cadc47e SHA-1: 1e782f931a7bb77ceb5dbebde67539737d2139a0 SHA-256: 939ebcfd31ab16bf6671fa225c414ec1102f34d4aa4e1dbfeeca48730e4975b8
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://yafferge.ru/123?utm_term=what+does+the+color+gold+say+about+your+personality In PDF document text
    • https://cdn.sqhk.co/bivuwusim/hjNQjiH/minagesafadufu.pdfIn PDF document text
    • https://zofawuzi.weebly.com/uploads/1/3/5/3/135323082/1336576.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/tedozum_zibutuzuk_gimuze.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/ic1iiYp/ding_ding_plush_throw_pillow.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/midaguvimabof/cts_sant_et_nutrition.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/tujininogotogog.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/backward_design_template_for_unit_planning.pdfIn PDF document text
    • http://funasuruwet.epizy.com/sia_blank_page.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/9822305701.pdfIn PDF document text
    • http://bevojekibawe.rf.gd/model_cerere_concediu.pdfIn PDF document text
    • http://fixobijuruloluk.rf.gd/44420965699.pdfIn PDF document text
    • http://vumavoralamo.rf.gd/arabescos_vetor_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/1626195427.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/42258698696.pdfIn PDF document text
    • http://vulikoviluxugu.rf.gd/3452385671.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/how_do_bunions_form_on_big_toe.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/44031423325.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/calendario_mundial_rusia_2018_mexico.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 5588 bytes
SHA-256: 8fecda9ffc4f37de11d503208f4b061b1f104fb3b821cf088eb03cfa891c27ae
font_01_sfnt_off0000fac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC6 10972 bytes
SHA-256: 6974914bf9e46256d12f49cb2e6c4e66e8700bf44a3b3bc7b21efd6eeda5b466

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