Malicious PDF — malware analysis report

Static analysis result for SHA-256 202790380feecfb8…

MALICIOUS

PDF

66.2 KB Created: 2020-11-10 23:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5b657945ca9f32930a205f532dfb71a3 SHA-1: 70c5771c3d8c90c82c805188ebaf82deb78d4083 SHA-256: 202790380feecfb8181cf797b53274838b79f482b29f3a790f93ab6a3d06eb6a
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it redirects to known malicious infrastructure. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves luring users through embedded links, likely for phishing or spam distribution, leveraging the 'Spearphishing Attachment' technique.

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://ggtraff.ru/123?keyword=critical+care+made+easy+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f8fb622d962f.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/fewinore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445337/normal_5fa7fd60b6bbb.pdfIn PDF document text
    • https://turikiripejuz.weebly.com/uploads/1/3/4/5/134501804/276534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368971/normal_5f9c0ac727625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5f890a0b3c662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369324/normal_5f8b043d3c806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385028/normal_5f920332740d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f9f93d677d3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412889/normal_5f9c3afd7edff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5f8a097e513d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_5fa46a689a6e9.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://uploads.strikinglycdn.com/files/a6c63fb9-0d47-4076-a169-da0c7b6dcaff/dotted_whole_note_meter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac3dbfb-82d3-4ab3-982b-fe09033daaba/crazy_franks_flea_market_mineral_point_wi.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_off0000badc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBADC 5000 bytes
SHA-256: afaa3f2dee0c910c246972500bcc1bb7767ff4d5e8b21a81bb84acae43e09f19
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 9972 bytes
SHA-256: 969b9e97c3931f34cfdab12c79bdeaef9decff3e45133536d1d17fad9a128059
font_02_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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