Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bdcd7378ad9e5a…

MALICIOUS

PDF

74.2 KB Created: 2020-12-16 12:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 512704d5daa1e1634e3a892b3eecef27 SHA-1: 1b9e5e182c4859253f9aab5c5bc31629580e9cb5 SHA-256: 77bdcd7378ad9e5ad7b200b1875c01323e0998b0f67a4446e5a81827422d44bd
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 0.9999

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://traffine.ru/123?utm_term=ejercicio+de+lectoescritura+pdf PDF link annotation
    • https://raxelapanaf.weebly.com/uploads/1/3/4/7/134746791/85cd7abc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405186/normal_5fc8964d526ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f96341b57984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_5fbddee18e968.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/9c67b3a5-7bfa-4e4b-84da-565a26975bc6/zipilaxerowoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76f26d88-ae42-4114-8065-3d6226be55d6/tubexikalofow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/318bcbce-776d-4cef-b94f-5dbee54ca795/29286357071.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0805cd49dd12447321748/t/5fc119eb645712565462c22d/1606490603862/valdrin_sahiti_dresses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd53cd2f-3ceb-4b60-bb7a-a90958d0114d/princess_aurora_costume_baby.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc18365f9866f3fd2d8aaf8/t/5fc51299e6d49a06bb3362d2/1606750882416/is_white_a_warm_or_cold_color.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/biodiversity_in_india_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3523b8ed-5493-42c6-8987-883dc1fc5504/13892045658.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/bodyguard_2011_movie_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 5180 bytes
SHA-256: 31917bc86a9294bf7afcc2bcb9859f0c350eb26b7f5dc0feeda71db593f0d93d
font_01_sfnt_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 11820 bytes
SHA-256: d0c4033cdba61cb9ac552ae78f87a64a9c43daecc4033bd1e2848a7a1bcb5751

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