Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd2aa6c38eb1668…

MALICIOUS

PDF

68.1 KB Created: 2020-11-14 13:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1c45d729de186a7bff1a6d5cee9d0b0e SHA-1: 90eedd882b564eb4efd5552805dbecbafb9a6ff0 SHA-256: 5dd2aa6c38eb166818b831b60daf64bc39aa7ae749b92c06b5c7e6fd8c177260
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing attempt. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=tuna+salad+with+eggs+and+pickles PDF link annotation
    • https://bijufipenonovo.weebly.com/uploads/1/3/4/5/134529550/rifozi.pdfIn PDF document text
    • https://sebonegipuwi.weebly.com/uploads/1/3/4/1/134108682/pimuzoxolos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_5f9eab7bf0423.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/538a5482296c83.pdfIn PDF document text
    • https://nuwegojoda.weebly.com/uploads/1/3/4/6/134603756/24d57be05634.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/fuxibogomafitejifikonu.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/the_game_of_thrones_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d809e8b-c7fb-494d-956a-152ddf2fee0f/72521572675.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/aristotle_s_theory_of_poetry_and_fine_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30fbfe4e-7fb7-4135-afca-8c5f84abcdf8/jimebevivesidololitimu.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/bps_launchpad_classlink_focus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b9c3ec1-b5ab-4495-b0c0-a964b71d2451/lexus_is250_manual_transmission_review.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_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 5344 bytes
SHA-256: 8a855f288251bb34125a21cc0556a69dee0408850cacf7f3fa36afebceb6b384
font_01_sfnt_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 11212 bytes
SHA-256: 9aa96ff99d3e4ee97440b14d407ef2c9cd1ee0798c3941451903105051e2390c

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