Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c144071ca0677f…

MALICIOUS

PDF

68.5 KB Created: 2020-12-29 16:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0d9bea537ac8e9859909df646629b72b SHA-1: 9721c8fd64f5076f3250962c2c961c5cee660ec4 SHA-256: 01c144071ca0677f4f6e10aacf30de6fb1afaad5dea4c1e1d9e3f9a0d1c4b6df
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use numeric slugs, indicative of a link farm designed for SEO manipulation. The primary malicious URL identified is 'https://trafffe.ru/strik?utm_term=digestive+biscuits+chocolate+calories', which likely serves as a gateway to malicious content or phishing pages. The ClamAV detection and ML classifier strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=digestive+biscuits+chocolate+calories PDF link annotation
    • https://cdn.sqhk.co/nupegefozub/GGidji3/space_defender_battle_infinity.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_5fb81b65a5bde.pdfIn PDF document text
    • https://cdn.sqhk.co/fabupiguboxa/hhgeghg/nulizimeguxogi.pdfIn PDF document text
    • https://cdn.sqhk.co/tavikagisato/iYkprhd/push_maze_puzzle.pdfIn PDF document text
    • https://buwupejobo.weebly.com/uploads/1/3/4/2/134265589/nikudis-futanujowu-befon.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/jUhahcz/battle_stick_dragon_tournament_legend_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5fb877711cd60.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/darabojip-molet.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/5e798797-3d93-44e2-90f9-9fde9da308fa/ketifogudetilelebexigaliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b064bda3-0cac-4c6f-a554-2a993d5b6f9d/world_history_timeline_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53f109df-389f-461e-86ff-b94f843decc4/computer_login_password_forgot_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79abc2ef-d46e-4772-996d-01b67bd09953/best_book_on_marco_polo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/616b0149-4e8f-4723-bb45-39a31434fe09/applied_math_problems_and_answers.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_off0000cf7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7C 5260 bytes
SHA-256: c25fa3417ae6fbba550240a59f64eb47dc56190155bb55fb4f31a126d22bfa1a
font_01_sfnt_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 10364 bytes
SHA-256: 0c06664cc2191083222fd5f3b86d4c06bb626f055cf9e2b1589af2acb1773b93

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