Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e35172d2deb95b…

MALICIOUS

PDF

51.5 KB Created: 2020-11-07 07:20:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a72105c04004bb9b9a38653c270dc3d6 SHA-1: 14c9df5822efc8fc3c6956647392f37d43b75a8b SHA-256: 50e35172d2deb95b4b8724453e21cb9c4f90200fff46e52cab5ec05d4aa985d6
66 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 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 1.0000

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/aws?keyword=alternative+to+drudge+report PDF link annotation
    • https://zugogulubituwo.weebly.com/uploads/1/3/4/2/134266111/739a2354a52.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdfIn PDF document text
    • https://pinoxelu.weebly.com/uploads/1/3/4/1/134108818/2717300.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/mepasosujub.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/4686de04f4.pdfIn PDF document text
    • https://pigasuranebuja.weebly.com/uploads/1/3/4/4/134459694/ac7b9d63950fcaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://gojifededub.files.wordpress.com/2020/11/66202153919.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/dvd_menu_creation_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7b3033-10f7-470a-bc99-9788649a59e0/novagudojonakaxikoj.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/glass_lunch_box_containers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cfc8338-3c1f-4f52-93db-fc2206d103a5/3690099749.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E75 4996 bytes
SHA-256: ca5d1db60af1f9afd4090b682b281459a66780ce68f5a0668e56add97d93e756
font_01_sfnt_off00007f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F84 1552 bytes
SHA-256: f55c20ba40ef196161d27a068cae9bcd7a0ad2b10dc89563db987942eae6e344
font_02_sfnt_off00008788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8788 10444 bytes
SHA-256: 4697bb0cf09ae17dd234e4def3e643453d81fe6f4737814040ddaa2c00f9dc6f
font_03_sfnt_off0000ab48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB48 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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