Malicious PDF — malware analysis report

Static analysis result for SHA-256 e952bd0cc2e05fc4…

MALICIOUS

PDF

81.7 KB Created: 2021-01-26 14:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4fb9c326b59ab8faa60d716fe7e31aa1 SHA-1: 5607a0a68f4efc3203ca021af377b24134e23d3d SHA-256: e952bd0cc2e05fc4c347a98cc76d586afe99a12b5da3ff15f6806af184594a8d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as a phishing trojan. The embedded URLs point to various external PDF files, likely part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=presto+kitchen+kettle+replacement+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fffb5a8cb728.pdfIn PDF document text
    • https://zozisumuwukow.weebly.com/uploads/1/3/1/3/131380825/foxipovunuj-dafusuludovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5fcb737cb2149.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388050/normal_5ffc3781e1b4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419205/normal_5fed677224dd2.pdfIn PDF document text
    • https://nuwoveforu.weebly.com/uploads/1/3/4/0/134099073/podamira.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423728/normal_5fd99f1499bf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468831/normal_6002a8c838d29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5fd62c074f27b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_5ff1f8635ad4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374022/normal_5ff31cd16d394.pdfIn PDF document text
    • https://vidajubobulixi.weebly.com/uploads/1/3/4/6/134650234/8468873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409000/normal_5fcc28e7e9d68.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/8883850.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484122/normal_5fe53563654de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5fdf35c4912f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_600b6c29c1571.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/xukonakefules/mariam_khan_reporting_live_mariam_real_name.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_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 5236 bytes
SHA-256: 01716aa77bc059f2838f7325a5719fa8b8ae59839958f36b2672dcb24ef578e9
font_01_sfnt_off000114b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 10664 bytes
SHA-256: 2a9586316522bdc9ee48816a1c711705d29a591ab667265f34dfe716fd553500

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