Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dce7cc80dc1cf4e…

MALICIOUS

PDF

67.6 KB Created: 2020-11-18 02:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2e7b5679fca687dcfc443d302f0d645c SHA-1: b755c3e530e62f4ac0fa1e604b7e746489250c14 SHA-256: 4dce7cc80dc1cf4e0c19c47ce70059ad64dbe33f4314867d5108f70c8bd89e12
156 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 a large number of external links characteristic of an SEO link farm. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/wb?keyword=beerappa%20songs%20%20dj PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f8726b828da3.pdfIn PDF document text
    • https://bawujepal.weebly.com/uploads/1/3/4/5/134515469/lirubidas.pdfIn PDF document text
    • https://lepuxodotedob.weebly.com/uploads/1/3/4/5/134507089/308175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f872ea97a3af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f8c72074bdf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370076/normal_5f88095daabae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5f911f453f476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_5fb45464962e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485442/normal_5faba27d17c9c.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/be4dfe98-5cd0-48ee-a8de-87dd92f0ad46/rearrange_sentences_worksheet_for_class_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870bb90d-e3fc-4127-a7b7-2335f3999f55/tevuvojuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d5ad778-82d3-4eec-9e8e-f980d6a93a95/dickinson_faith_is_a_fine_invention_analysis.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_off0000cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 5220 bytes
SHA-256: fe350808970901302e9814f5774435b5780c050fae84bfb326ab43dc739b5511
font_01_sfnt_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 10520 bytes
SHA-256: daf23b670a09f8721031e3515d6b191c2f625dc960edee43a179593054fef42f

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