Malicious PDF — malware analysis report

Static analysis result for SHA-256 098f2ce977fa0dc8…

MALICIOUS

PDF

85.3 KB Created: 2021-02-12 03:31:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d84896306ae7edcf4ed97f0966c909eb SHA-1: 7f7207a0bf9c02bd92c9a354cdabd3ef46bf20ba SHA-256: 098f2ce977fa0dc87a207dcf22c6d160d29b927bbc7d536d092ce01b47e969e0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-farmed, suggesting a malicious intent to drive traffic to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate malicious content, specifically identified as a phishing trojan. The embedded URLs, such as 'https://seumenha.ru/wix?keyword=algebra+with+pizzazz+answer+key+page+189', are likely used to deliver the final payload or redirect users to phishing sites.

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://seumenha.ru/wix?keyword=algebra+with+pizzazz+answer+key+page+189 PDF link annotation
    • https://cdn.sqhk.co/kufedefivuvu/cgcIjed/super_mario_world_all_secrets_map.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/hjyLamT/redoselawawolopuvuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477408/normal_5fe27678e2f32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391008/normal_5ff65aff9d2f0.pdfIn PDF document text
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/kikasipovewevapim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5febecf0cfedd.pdfIn PDF document text
    • http://pafekusiwajida.66ghz.com/gastroparesis_guidelines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382414/normal_60033e0534a35.pdfIn PDF document text
    • http://tupedesixavero.iblogger.org/bavenuwopotonamuninivu.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/ee3874.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/ljfiwib/99738517193.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/vqidQgf/91981560952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480744/normal_5ffeb851e67f7.pdfIn PDF document text
    • http://ssurll.com/10na51In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/megulu/bubujexopewaba.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/plan_andorre_la_vieille.pdfIn PDF document text
    • http://koxaxinum.epizy.com/mapozalojumosof.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/html_email_contact_form_7.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/bts_love_yourself_answer_full_album_audio.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_off00010e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 5920 bytes
SHA-256: bc1693fdb76d8dadb75f70a59730a97c3e90ff382be66e2d43a458a8f684bb51
font_01_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 10824 bytes
SHA-256: 43851797baab6681492e8a518dbbede5b26fdd30b8a25115d6c1d7f911e0aaac

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