Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c14af41ae145b5…

MALICIOUS

PDF

78.2 KB Created: 2021-02-23 12:47:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 803c7d1a957b8f62839e480fa7ef91f9 SHA-1: e02ee3167d80919574a61a4b5918f675e49adc4b SHA-256: 05c14af41ae145b5d67b5664a6cdbc7352e3402040ef26b9fa6fb9ab41326df8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the presence of embedded URLs and the overall structure indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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://jottigo.ru/aws?utm_term=what+is+management+information+systems+reddit PDF link annotation
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/larojoza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_5fe75e4148b9b.pdfIn PDF document text
    • http://arm-watch3.club/17917225639pb5qu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5ff49de848459.pdfIn PDF document text
    • https://fajorisovobune.weebly.com/uploads/1/3/4/7/134752278/fec00f5324503.pdfIn PDF document text
    • https://ranefizowu.weebly.com/uploads/1/3/1/3/131384017/78cf1c5448b386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455907/normal_5fcbeb2935306.pdfIn PDF document text
    • https://vefutafefu.weebly.com/uploads/1/3/4/8/134882527/6264210.pdfIn PDF document text
    • http://prizinsta365.website/11071575133rzy82.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/fixararololu/acha_chalta_hu_song_dj.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/shimla_pahari_video.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/information_report_structure_for_year_1.pdfIn PDF document text
    • http://pupekulojam.epizy.com/how_to_reset_alcatel_go_flip.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/system_administrator_interview_questions_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_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 5404 bytes
SHA-256: 04d2b0b823bdf32ef6d67e3d98d2833e2ebdc4f20d54f17df0359e01f6e27322
font_01_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 9936 bytes
SHA-256: ef2b500e13b2035e55c4896d56f832786bdbeda259523b9d66f47434b87301d3

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