Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b250e5ecd374108…

MALICIOUS

PDF

205.5 KB Created: 2021-05-25 02:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 97c68c5258ed6fff1ee6d15910a82b1e SHA-1: c40ed09e9c01dd389b7908af82531d5fcd15e483 SHA-256: 4b250e5ecd374108fc0bae14ca22d82f3552cda06801f7f8bf0716148f15a689
96 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 embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kuzutuzo.ru/strik?utm_term=turnitin+login+reddit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366364/normal_6011d3254ca21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5fcc3ae952c78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_6002ae9115ef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_6022f52331fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_6044fa9ba94ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385853/normal_5fe503afb49ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460473/normal_5fde4d20cdee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_6033d34a7b022.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470698/normal_605a0855c2657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456143/normal_6002d363db621.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491671/normal_605ee14ca1d77.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/jajuzasalikirut/a_house_on_mango_street_themes.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/chokher_bali_book_in_bengali.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/contemplate_synonyms_starting_with_m.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/purolulugubusoniremavin.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/durodukivigudesolixexok.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/wazibi.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/bavagi.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/love_percentage_calculator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/city_of_glass_paul_auster_audiobook.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D8C7 4556 bytes
SHA-256: e5231595dc999db5020abcd1fde15b3fb8d94a926f625a701bc030a3c7d29813
font_01_sfnt_off0002e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E852 12384 bytes
SHA-256: ead277c6c04ff543a8f656efa401feeb4bb99b60e75bf5bdcd70bdc78e8fe4f7
font_02_sfnt_off0003129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3129B 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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