Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3ef96e8451aaa6…

MALICIOUS

PDF

73.8 KB Created: 2021-02-11 06:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 932fcc14e1c92abfc6a7508453cc739e SHA-1: 71b6fe470a562656f61df35ab817253db7fef901 SHA-256: df3ef96e8451aaa6293dca73d479839cecd10a43035ecccfcc145b2de46b4e75
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and a machine learning classifier also flagged it with high confidence. The embedded URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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://seumenha.ru/aws?utm_term=animals+photos+free PDF link annotation
    • https://povuwifapijolak.weebly.com/uploads/1/3/4/2/134265363/mezofife.pdfIn PDF document text
    • http://vitolebizojigok.22web.org/81311225175.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fc6060e428e4.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/w37ghNv/tik_tok_funny_video_clips_download.pdfIn PDF document text
    • https://nojefawagalubab.weebly.com/uploads/1/3/4/2/134266261/9590089.pdfIn PDF document text
    • https://cdn.sqhk.co/ninujamezol/hfgcIie/riverside_drive_in_leechburg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420448/normal_6002632005775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476938/normal_5fe5e99ea2618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5fcaf0b35c3d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382790/normal_5fc78e7e28b98.pdfIn PDF document text
    • https://cdn.sqhk.co/lokutibu/fJXgeif/draw_a_stickman_epic_3.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/oihJhfj/vefezitijaginog.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/wozoxub/cartoon_hd_apk_2018_ios.pdfIn PDF document text
    • http://zogaxemajov.epizy.com/crown_budget_worksheet.pdfIn PDF document text
    • http://tomijejimener.epizy.com/facebook_video_without_app.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/92724998494.pdfIn PDF document text
    • http://vuriruzuminomu.epizy.com/crusaders_quest_challenge_mode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/lesuroriparel.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/setawedujuvutixepifive.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/acpi_int33a0_asrock_driver.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_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 5132 bytes
SHA-256: e928eda34b79ad09238a648e346fd87e1dc8d121a9d16feb5855ec29d5c46a78
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 10692 bytes
SHA-256: e22e4351f7622054aea404053f428c2b2df00e16558d2bed596e1dee4b14e16e

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