Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0eaf6c48775fe46…

MALICIOUS

PDF

86.1 KB Created: 2021-03-21 12:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9868f60f6a22b786ba4dd82ca8ef7fc0 SHA-1: 59fea2349a156128df5b9736ea8c2e454d6904d1 SHA-256: b0eaf6c48775fe46639e5e609b089422ec74f3ebbb9e289d44772964a6b815eb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign content, suggesting a link farm or SEO manipulation tactic. One external URI, 'https://xajibur.ru/award?keyword=type+d+accouplement+m%25C3%25A9canique+pdf', is flagged as suspicious. The ML classifier and ClamAV strongly indicate maliciousness, classifying it as a phishing trojan. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=type+d+accouplement+m%25C3%25A9canique+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427544/normal_6034e080bcc71.pdfIn PDF document text
    • https://peguduzivinaw.weebly.com/uploads/1/3/1/6/131606374/1067745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484818/normal_6019f48fa2233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5ff96e7d2b791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_603b73ed8ac2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417327/normal_5fc9fb382756d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447631/normal_6023ee9f8cf96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368219/normal_6014d6195ed6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_60225091ce3f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491437/normal_6000c045e0781.pdfIn PDF document text
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/9911993.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/robumuduluwise/one_day_in_the_life_of_ivan_denisovich_quotes_about_god.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/36166104491.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/26926032540.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/aabb_technical_manual_19th_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/bash_script_example_with_arguments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fffeb1d-b0a6-4883-88c1-d18ee13e7f05/70156624747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfad3aa-02fe-4188-9d86-59cd13d21619/wodevotogaxujebididumi.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/fufifokatonapabif.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/carcereiros_2_temporada_mega.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/content_analysis_of_facebook_posts.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/rufediradililito.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_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 5348 bytes
SHA-256: e346b19259d6fe9871b50a976398c22fef9c8acade3d2ad568dbe74f43aa35e1
font_01_sfnt_off00011d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7D 13796 bytes
SHA-256: 2281ddbba93c3c69908d987e851f4b0eeadca1cb5c7bfdba210d68ba9586c6cc

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