Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d9e1f280f5e1bc…

MALICIOUS

PDF

66.5 KB Created: 2020-12-05 05:32:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 822c91955a4c5b4a7ac1854bdd966bfd SHA-1: 96231a521142c59a01a301128760b29a9d48ec34 SHA-256: a2d9e1f280f5e1bc923ec896d130f813f35e6aafd08e86b547245231455b7adc
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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 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 4

  • 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.
  • 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/strik?utm_term=crafting+guide+for+the+escapists In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_5fbba08a57fac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5fb5ebe5ac3b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388165/normal_5fba44552cfc1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_5faa7131d4a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fa1e8596878d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466680/normal_5fb32d10371e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_5fbefa2225ccd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc537ce3398ff75154a1c50/t/5fca7b7ab6652f4a35b08679/1607105404348/parenujuzotevusadixexibos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b719b2-0bc1-4179-a904-8e599ca06b55/nisofusuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672a3069-c914-44ac-bb65-aa55e18bde7f/vawawakobonajixuteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/780acb78-bcd1-4d05-bbdf-8f5d5a289ee0/chmod_755_android_gradlew_in_window.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a641c76-6256-4610-974e-cb2e497042f0/hotpoint_refrigerator_manual_hss25gfpaww.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_off0000c874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC874 5292 bytes
SHA-256: 83385d7f60794429c59f1f5139f6c12b448ae264d62ffddddd3c8d0743daf855
font_01_sfnt_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 10228 bytes
SHA-256: 3fde49108a7ac17b150e08cba7ee4d170b9df767cae34cff9b597f52bec338b8

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