Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b016efa4ef2e91…

MALICIOUS

PDF

95.1 KB Created: 2021-02-19 09:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ff0da48b79f4792fb15c15d7a3db8c20 SHA-1: e5dfef2a707fd5fe4c4753c58ff10ca8688937c7 SHA-256: c3b016efa4ef2e91fc9d199cf9e490f448012d9a956c8a629e4934e3974210d3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=the+social+contract+thomas+hobbes+summary PDF link annotation
    • https://xigefazevape.weebly.com/uploads/1/3/4/6/134632801/860559b295.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/EHXNBjg/chess_techniques_for_beginners.pdfIn PDF document text
    • https://vifutezovabul.weebly.com/uploads/1/3/1/4/131408528/silimu.pdfIn PDF document text
    • http://mgacessoria.online/15647698587w95vw.pdfIn PDF document text
    • https://wasavegod.weebly.com/uploads/1/3/4/5/134589575/0faf0b6e781.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/VihijLS/maxpreps_softball_rankings_colorado.pdfIn PDF document text
    • http://alcexpress1.xyz/blank_d_d_character_sheetfv21z.pdfIn PDF document text
    • http://about-igsupport.com/concurso_tj_pa_edital_2019l9hlr.pdfIn PDF document text
    • http://reetodo.online/garix8vrgm.pdfIn PDF document text
    • https://tagorawijetix.weebly.com/uploads/1/3/5/3/135392874/8567932.pdfIn PDF document text
    • https://lotojenamiz.weebly.com/uploads/1/3/1/3/131381761/e6bf79.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/dazawojob/platinum_physical_science_grade_11.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/pewidifonotanupalok.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/bodyguard_telugu_movie_hd_video_songs.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_off0001378d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378D 5228 bytes
SHA-256: a6391dbd359f98eab32e72a9c52c14f5c7a37192daa7be94aba6339b600e8118
font_01_sfnt_off00014934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14934 11504 bytes
SHA-256: 644d744e48a184650db7ac1af1105805c624daced09150841b79bb72049f65ca

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