Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7d1d652f5bb2b3…

MALICIOUS

PDF

71.3 KB Created: 2021-02-11 00:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6376eec8c4d1ec63b389ba1a7d53f466 SHA-1: dd0c608289f65e6c23d6f6304975c3a93bb66b85 SHA-256: 7f7d1d652f5bb2b334a10acabb065e79039f56a49ae63dc20a8afe345195c49f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=pat+mahomes+parents+randi+martin In PDF document text
    • http://kindraretterath.com/subject_improvement_plan_template4besk.pdfIn PDF document text
    • http://policyhelpcenter.com/carols_by_candlelight_2018_melbourne_tv_guidefucoq.pdfIn PDF document text
    • http://weraka.online/73833320907pkt6k.pdfIn PDF document text
    • http://vashastrahovka24.ru/sanogejiweferumx0dc.pdfIn PDF document text
    • https://biruwilajefi.weebly.com/uploads/1/3/4/6/134651793/11959.pdfIn PDF document text
    • http://help-igcopyright.xyz/day_planner_template_microsoft_word97x8c.pdfIn PDF document text
    • https://fifikasato.weebly.com/uploads/1/3/1/4/131437502/ruwifebofezawaborepu.pdfIn PDF document text
    • http://reduslim-ufficiale.website/20519153270csv12.pdfIn PDF document text
    • http://onlineeshop24.xyz/pepawudikedekatsa7jx.pdfIn PDF document text
    • https://wuletalevuvefam.weebly.com/uploads/1/3/1/3/131379877/2224004.pdfIn PDF document text
    • http://fherixq.com/university_physics_with_modern_physics_13th_edition_solutions_manual_free_downloadu0icp.pdfIn PDF document text
    • http://biotringel.shop/9858691486792pou.pdfIn PDF document text
    • http://bigpleasure.ru/ms_excel_tutorial_free_download_2020mknw1.pdfIn PDF document text
    • http://bella24.xyz/anandi_gopal_full_movie_watch_onlinez2kay.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/resabomibogodaw/lead_sheet_music_software.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/centos_release_6._4.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/tamil_songs_starmusiq_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/types_of_dogs_94_percent_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/bollywood_mp4_movie_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/nelozax.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_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 5168 bytes
SHA-256: 4b1023fd0b83646f15ea974c13be3ab41c1a4677a010e68a659bb6d061fc476b
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 10696 bytes
SHA-256: 1a827e16dd0374ac8d3e5a31a17415e300d91f1eec626665e00cb13e076e30e7

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