Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b09aea7a2c3141…

MALICIOUS

PDF

65.7 KB Created: 2020-11-19 02:56:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a2fbfa564af1f0bb6244e6e48cf23c4b SHA-1: d7aa7acb68d959f17804ade16012205762ca316f SHA-256: c3b09aea7a2c3141dc889f3ebc044287f6252967a5ba950b30ae3f3294e59c48
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-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://traffnew.ru/123?utm_term=dabrico+manual+inspection PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403820/normal_5f9cdc5e375e4.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/mezevoxinokimuwamibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477138/normal_5fa7d9079becb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424935/normal_5fb265a2608a2.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/c1d693d6-d6be-44bd-8b8e-5a5d16d6f26f/the_pebbles_and_bamm-_bamm_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9790c6a-c95f-4ba7-b2b7-6400ac5b45c3/56469584893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21f93f27-a9bf-4fdd-b210-153f8676a131/bristle_worm_trap_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbc7a02-e3f5-4f52-9506-c22f201970fe/dukekitunebonoditevuvasir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ec08a0-2a6f-452f-b44d-78ead9249452/12378691761.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/zeponul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a14a908-a528-4a85-8af7-d2775d6390a5/sebirux.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/proyecto_neoliberal_del_estado_mexicano.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_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 5220 bytes
SHA-256: 8f7ec17c96ea6a2f9eb892b727307498f21c8dad777e5b561649368c596e3c4f
font_01_sfnt_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 10844 bytes
SHA-256: c68717e5e36c4e99d6899f075b2baf35423628bc92485ab3cfb8790264080e02

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