Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8febdcc12dff585…

MALICIOUS

PDF

75.6 KB Created: 2021-02-19 05:41:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9ebc42ee3c98b636f6fda8fd92b6893d SHA-1: a0b87ba2f40d9491189ea0fdfabde624cd06ad4f SHA-256: b8febdcc12dff585bc808c22d9474ef092e19cf7da4dbeb960832f1edb52a08f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the primary goal is to redirect the user to potentially harmful content.

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://jacksth.ru/123?utm_term=are+starburst+chews+gluten+free PDF link annotation
    • https://kivalake.weebly.com/uploads/1/3/4/8/134885121/golotufopuker.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/jaiaRGw/project_resource_management_tools.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/buzivebopab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404976/normal_5fca4baa4bb95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_6015554ada477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417824/normal_5fc779565e707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417308/normal_6002a7ad33b81.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/5vvDjch/five_nights_at_freddy_s_free_download_4.pdfIn PDF document text
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/683291.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451019/normal_5ff373923fdc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_600e51b0e85be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_602ad1c8641d2.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/Nigjjgt/song_hopelessly_in_love_with_you.pdfIn PDF document text
    • https://cdn.sqhk.co/somepizeko/ihUf7gi/animal_jam_parents_sign_up.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427284/normal_602ba52010957.pdfIn PDF document text
    • https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/wizoviwo_rujumulewudid_vemixojeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457848/normal_60132d8ed690b.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/bulozor/princess_diaries_book_4.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_off0000eb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 5364 bytes
SHA-256: 92b32d7df1d0b25c75eb6061934688963542dddcb2c6f61383cd4824ee98ad78
font_01_sfnt_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 10352 bytes
SHA-256: 1cdb3e2a56820733174c169dec057d8e2fb9b980edea90f67e59c758554d9f16

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