Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f152d4a1a34c37…

MALICIOUS

PDF

63.8 KB Created: 2021-01-03 05:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: baa3d2d43c27c382edcdf8a2b2f4e5e2 SHA-1: 2832727e61f36e2c3b1801a13e33d89a1fc5ca5e SHA-256: 73f152d4a1a34c378424c18e3366862361a38871311eb58431babd8d47b388e9
214 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to potentially malicious redirectors or link farms, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV also strongly indicate maliciousness. While no scripts were extracted, the structure suggests an attempt to direct users to external, potentially harmful content, likely for phishing or SEO manipulation.

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://cctraff.ru/aws?utm_term=bridge+to+ielts+audio+free In PDF document text
    • https://cdn.sqhk.co/baxemazisod/ifDQl9j/history_vault_gift_subscription.pdfIn PDF document text
    • https://likuxosudiva.weebly.com/uploads/1/3/4/6/134603152/2240477.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/baserop-xunukuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485443/normal_5fbc2a50bbf3b.pdfIn PDF document text
    • https://cdn.sqhk.co/ninivaxibab/d5VJgch/namofovisogexal.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/jggDCjj/party_city_coupon_codes_september_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/2Djdwhj/wobuvigumilobejafukewer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481400/normal_5fe2d732960b5.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/icTjbA9/incandescent_light_bulb_color_changing.pdfIn PDF document text
    • https://cdn.sqhk.co/jelivapizivo/lhajep5/5890816635.pdfIn PDF document text
    • https://betetudiju.weebly.com/uploads/1/3/5/3/135348010/53b3fe728b038.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d01c11f6-d1e1-4bda-82f4-8416b77c7558/respuestas_examen_psicometrico_evalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e94125-cbf5-4ac6-8910-20476c9cb44e/makaguwig.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_off0000be2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE2B 5124 bytes
SHA-256: 49120ce2289dd68df5b075fc4d43cd7c54cbbc405c94d9cea74a4d10fcc2068c
font_01_sfnt_off0000cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 9792 bytes
SHA-256: 104e12c57988f3b678011884ef3ac7ed48fd99ea8a5fc6591367e1b7fbcfb8bd

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