Malicious PDF — malware analysis report

Static analysis result for SHA-256 438d1ab1b5192e93…

MALICIOUS

PDF

63.2 KB Created: 2020-11-13 17:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 66e839ee9fd6beef9f606c5aefabe721 SHA-1: d94808cf34ff13ffe9e1fa89cbce1a2949b0e4cb SHA-256: 438d1ab1b5192e93f01d12622b3f6f791b0217cdc12bb48498a39ef174f21122
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://traffset.ru/strik?utm_term=greenwood+sc+recycling+center+hours PDF link annotation
    • https://jazafojof.weebly.com/uploads/1/3/4/3/134310209/9086341.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5f8e46dd9cdd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457006/normal_5fadcc6e4573b.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5650151.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/da50c7e0ec8f483.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/eed5904d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5f9de000cbd79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f8baaf560784.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/3b3da70e-9f68-49f4-9fce-32f92ef24c70/craig_mecanica_dos_solos_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb7dfc35-a3da-49df-9e24-c8028a3dd7d3/62677039876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b39b1d-62b3-4116-801d-41bc2223b4e7/zoxipawoduwubox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba49a44-ab5c-4c07-9f9d-e0e646931dd6/behen_hogi_teri_movie_hd_filmywap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58740b3-2130-45d1-bc6b-4698f7278944/32810420982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c407b017-c959-4bd4-b45d-cf329d99735d/game_of_thrones_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/novewowikoguso.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/74945660280.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_off0000b9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BB 5216 bytes
SHA-256: e410035fbe88f2c96c12b0fcbb09d13efd1e907ed1b809555ee17a3a9966beab
font_01_sfnt_off0000cb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB92 10648 bytes
SHA-256: 834612f4e344b9945041ade5f35423e40a2e73bbff20e1cabfc117884b29bdea

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