Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ba7d76ca766385…

MALICIOUS

PDF

69.0 KB Created: 2020-11-14 21:14:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 61f8a6fd740732cd4e28ea40a79f9d02 SHA-1: 9890364a17c875d475d04c0795702f50e432ae6e SHA-256: 51ba7d76ca766385c020fb69d2b9a77457975d48a906e101bc7eaa11ff9862f3
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://traffking.ru/strik?utm_term=entrepreneurship+the+practice+and+mindset+free+pdf PDF link annotation
    • https://pojutawetuje.weebly.com/uploads/1/3/1/3/131382470/6701a34.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/0b40b762c.pdfIn PDF document text
    • https://sorimuzumetig.weebly.com/uploads/1/3/4/5/134519591/tuwipukej.pdfIn PDF document text
    • https://zoliparudoluja.weebly.com/uploads/1/3/4/6/134662317/jewidarofefinas.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/820458.pdfIn PDF document text
    • https://supixevobaje.weebly.com/uploads/1/3/4/3/134356264/51f833f.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/0d2dafad-c515-4c5f-bd84-c97b5c688ad7/10495663158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b302fd6-20dd-4177-8c04-25dbca02595b/96715342511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a35d710-7dfd-406c-9a2d-ab7334319e6d/59042115773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/979d922e-a857-4135-86e3-5990763d49bf/the_life_and_opinions_of_tristram_shandy_gentleman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e0039f-51c3-4115-af35-de10f326476a/sagomutiruxamadagef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fd6d6b3-f0a3-4dc4-aacc-76bb2f73d9c7/26579213443.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_off0000cff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF2 5320 bytes
SHA-256: 0f72901b8ce808d06ca91ca9f1a6015c0121ad4ea40dc4260ae44742bd21fb68
font_01_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 10768 bytes
SHA-256: 12021baefab5d5559865b3cf8fd5b64d192c1aa9622624f87db4676e8d6d46cb

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