Malicious PDF — malware analysis report

Static analysis result for SHA-256 45036ab44921bdb3…

MALICIOUS

PDF

67.4 KB Created: 2020-11-22 15:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b55afea37d268c2698e057acd5fbe78e SHA-1: 736dfef1ce3f9a5a3d9311df239b8ff6680ee734 SHA-256: 45036ab44921bdb32dc747865dc803b88d2c7402902da947f6c001e9f0afc71f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV and an ML classifier as malicious, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic, along with numerous external URLs, suggests the document's primary purpose is to redirect users to potentially harmful websites. The document body contains garbled text, indicating it is not intended for legitimate user consumption.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=problem+solving+strategies+arthur+engel+quora PDF link annotation
    • https://jitoxegewizo.weebly.com/uploads/1/3/4/4/134460998/wutepifosinafu.pdfIn PDF document text
    • https://bidutujube.weebly.com/uploads/1/3/4/4/134403342/zebuvod.pdfIn PDF document text
    • https://pidivupam.weebly.com/uploads/1/3/4/3/134327465/4361032.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f86fc97ae326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5f9db2345103c.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/xefezesebusu/97510206324.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/50602932039.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/authorisation_letter_format_for_post_office.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/78377983821.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/xowujamiv.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/50641463823.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/human_capacity_building.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_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 5428 bytes
SHA-256: cff87309a23aa89a93c259339c0cbaf3f7934d639e84a2692b265ec684eef234
font_01_sfnt_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 11180 bytes
SHA-256: 9765aa8afda7076da8d14f6b8ef41d331a429c986b9d2b2efd55baa0be9c2ad5