Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01518d0532b8808…

MALICIOUS

PDF

81.1 KB Created: 2021-03-11 10:22:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 6efaefeaf7bcd20aabbd8f9af12b984c SHA-1: e0b7cfb081f9d36d800fa612b35dfd9c5ce468e1 SHA-256: a01518d0532b880826f5eaa3ef8f1131354ce2672e94d59c0365d29209c7aa17
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's structure are consistent with attempts to redirect users to malicious sites.

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://jottigo.ru/123?utm_term=hot+dance+dj+mix+song PDF link annotation
    • http://avbox.org/60280768128xfnhm.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/hiehiji/kidcity_youtube_net_worth.pdfIn PDF document text
    • http://natbeach.space/seporuxijutukavaranop8y1cn.pdfIn PDF document text
    • http://perevod-card2card24.site/yankee_doodle_fife_sheet_musicjogjk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488806/normal_6045803ae4118.pdfIn PDF document text
    • https://xojolulodi.weebly.com/uploads/1/3/0/9/130969725/nizitebovubesu.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/wNJhbHy/dezebadite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_60317cf65004d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448341/normal_6032e1a0b74d7.pdfIn PDF document text
    • http://mkr-olimp.info/is_it_okay_to_do_1000_pushups_a_day46ttc.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/ibtiijd/find_switch_port_via_mac_address.pdfIn PDF document text
    • http://reduslimitaly-official.site/rugaruxuworovovazt29ai.pdfIn PDF document text
    • https://pizewenijanud.weebly.com/uploads/1/3/0/7/130775868/rekebogobupuw-rizexota-tigojogiravuje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_cfcc722126dd42c0b21809e3d5fb5ca9.pdf?index=trueIn PDF document text
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_5ea90ccdf929405ab4fe8c89f7d64d26.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_d693d98a5d6149eda322fbfff2cf417d.pdf?index=trueIn PDF document text
    • https://2e243477-d0d7-4d97-acdd-9ec3899f5e1e.filesusr.com/ugd/5ecadc_37fb649e517e41589ebb05a2ca73a0c7.pdf?index=trueIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_b1777d15df75420880b8420a5b44cb0e.pdf?index=trueIn 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_off00010249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10249 5236 bytes
SHA-256: 8896bacec9ff4b4b9a838e89ed5285fab27450ac3032ad1a26fc8ef4fefd3ef9
font_01_sfnt_off0001140e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140E 10272 bytes
SHA-256: 566af514c27d68243f86960f8a240cf2cac5d4ae94f854cac91e207f100aac19

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