Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89dc0784c0d1d1e…

MALICIOUS

PDF

75.9 KB Created: 2021-02-23 20:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9b7abcb9e4b6b459dcb23e8d057fc4f9 SHA-1: 9f235885208f8d37c1da123f64be34ffdc197575 SHA-256: b89dc0784c0d1d1ea600f3abf42405b05a085cb7df68f78e5188818bb28ff322
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 0.9997

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://seumenha.ru/123?utm_term=how+much+is+a+brand+new+ipad+mini+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421611/normal_5fd1f7517b1f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_603544c5880f1.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/6RsjGvS/73453195903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376098/normal_5fecc0c83914d.pdfIn PDF document text
    • https://fubuwadedaxas.weebly.com/uploads/1/3/4/8/134897716/8204358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446264/normal_6014a1ba4c2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_5fd5f62580ee4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5ffc04b21e610.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/ijarIjf/final_fantasy_xv_a_new_empire_gear_guide.pdfIn PDF document text
    • https://jejomedilad.weebly.com/uploads/1/3/5/3/135316302/e35b354144c42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_601e95a48d6ca.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
    • 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_off0000dec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC3 5408 bytes
SHA-256: 33425ea59ebb3a58f31309b8b63af4e47b5e74e80a91582e4329cf58b1be4351
font_01_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 10336 bytes
SHA-256: 822fa9211b9e6f241d1f6d5ea4b50878ef91b8bdbc6cc1f42c8e6bb08c96988a
font_02_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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