Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcd97104b781284…

MALICIOUS

PDF

62.9 KB Created: 2020-11-10 07:16:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ad4e4687bb99186a6deeb8bf3a7933d1 SHA-1: b718db23c3b2cda9fb19b3297f9dbcf8db681f97 SHA-256: 5bcd97104b781284391d7fcd6c1e574483422738d130e26f65569cc233d8edf2
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://ggtraff.ru/strik?keyword=earthworm+dissection+lab+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_5f9e53fb7c205.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5f9f3a483d0ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f939d7825597.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1109957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416132/normal_5fa5e2ba72383.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/771a91e7-e14a-4b6a-8ca3-8b6f1e941644/satuwoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c562c137-4dcb-4fb6-aa78-4f9d837e458c/25515748017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36b97801-b4b8-4552-93a8-63a955ec4452/soxatezelepox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2499a79-38ab-40ec-805e-ec17cea42a15/vibakanovuwikisi.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/search_inside_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/how_to_convert_binary_to_hexadecimal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424cd723-2bde-4a89-8a56-c0bc07849fb1/danganronpa_v3_nail_brush.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/958b9c12-c50f-4984-bc2b-0b99d60941f6/26980418734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fc9eee7-2ad6-4d8e-acdd-9ccf746087f5/fumilorizikubefesi.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_off0000bb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1F 5536 bytes
SHA-256: f6f43ec5895a6465f9f5e076f54d86b2c1afa3d080d8fd57482ace82e990c2ce
font_01_sfnt_off0000cddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDD 9596 bytes
SHA-256: a6ab79f00ffff76f09504877f31f93a482b9a221d746d6099fc37beeed54efed

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