Malicious PDF — malware analysis report

Static analysis result for SHA-256 c879d30273fe96eb…

MALICIOUS

PDF

59.2 KB Created: 2020-11-24 09:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e60202c8fd08905dc3ed89c743db45d8 SHA-1: dbfdcdc22ce5243b9f2f8dcaafe7e25c637495a3 SHA-256: c879d30273fe96eb34b5b1cc2d0a19b7c7f71c4bb2c65268cf6d77ad499cdace
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 0.9996

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://traffking.ru/123?utm_term=allyn+%2526+bacon+guide+to+writing+pdf PDF link annotation
    • https://zelapagetuwuj.weebly.com/uploads/1/3/1/4/131406140/6686678.pdfIn PDF document text
    • https://soxupewo.weebly.com/uploads/1/3/4/3/134392520/kezirosilokadu.pdfIn PDF document text
    • https://mivopolidenez.weebly.com/uploads/1/3/4/3/134349928/822814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_5f9724fe71dd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443372/normal_5f9cb60e1d702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406782/normal_5fa34a9ae893d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_5fbc8ad31d761.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/e91707b9-a777-4dc1-9e58-ee80e6c07e8a/hp_envy_x360_review_cnet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5420d17-133d-4d9b-a721-2b8ff723a85a/noxabuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c78c52d3-f4ad-4665-88ad-e231f8d63b65/gta_trk_indirme.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/74279752974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d587da2e-fc83-45a2-b915-871539a22689/47268104263.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/nogobivabopememonojoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b3362c-f1b3-4b0d-b355-852b3008179c/kagiregefez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f2827a-77b1-4e91-bb01-f792930611b6/38381545550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea058b5a-3c39-4c0e-b314-eb9ab4a91212/andrea_vilas_boas.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_off0000b06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06C 4280 bytes
SHA-256: 5253d5810622057fb2059b146da150a59e04b570363350feeaa5bf0706cc892a
font_01_sfnt_off0000bf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0B 9752 bytes
SHA-256: 961d5a0ae8b82ebb54717010af09bf591b4a775c754405d438898d3c487430dc

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