Malicious PDF — malware analysis report

Static analysis result for SHA-256 f783bec902d343b7…

MALICIOUS

PDF

79.5 KB Created: 2021-01-10 00:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 55daa5880063e55748c04654c3b815fb SHA-1: cabe60e37151b7abe920e27ecc3ef054a747b74b SHA-256: f783bec902d343b7d10ba99e85c82f39e076c298739fd11afa65cc3a05a84655
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware delivery.

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://traffmen.ru/123?utm_term=turbo+wifi+apk+2018 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5ff81e393d513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387814/normal_5fe9ad842443a.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/ijOhfgd/best_irish_craft_beers_2019.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/gimureve-xifapusotejumiw-pivisamagadi-minulumize.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/9570135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421335/normal_5fa0c5ce1ee19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479214/normal_5fa744ddac19a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481821/normal_5faf377295769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446781/normal_5fa423e289d22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_5fdddd9f5f7fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407331/normal_5fb4bbb49f558.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/xazarujokemus/hacking_tools_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/division_worksheets_for_sixth_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/23044532191.pdfIn PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/luvebunizuxulorez.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/los_pasos_perdidos_alejo_carpentier_gratis.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 5448 bytes
SHA-256: 2b6be0822d0757d5c7ecab56e736297ea48220a75937defe6fe7fe48ddaef097
font_01_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 13424 bytes
SHA-256: 11a3328a28f9c2ebd3db8a095a0d3a5e91053a4726b5569fd6f10666f186bef7
font_02_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073

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