Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec412edc734eed7…

MALICIOUS

PDF

72.0 KB Created: 2021-01-30 14:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c8975061c9d49dee209fdae8335714e6 SHA-1: 3ddbc8837505c8773a8c5f8010e4181bc55ff8a8 SHA-256: bec412edc734eed79396eea8b861b2836e061ffa13639cf8d234f6cd4a3c6a3f
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV detection and ML classification confirm its malicious nature. The embedded URLs likely lead to further malicious content or phishing pages.

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=advances+in+biochemical+engineering%252F+biotechnology+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5ff344e33bd0a.pdfIn PDF document text
    • https://jidegumot.weebly.com/uploads/1/3/0/7/130776526/jigewibekeminonivit.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/40b77e532d556.pdfIn PDF document text
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/dinesuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_60073a6acb2ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410027/normal_5fe21a0aa05b0.pdfIn PDF document text
    • https://zojozonamu.weebly.com/uploads/1/3/1/4/131438692/wewobukejoji_xarewa_jobabaz_sulumijepefiju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367621/normal_5ff972d03a73a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480898/normal_5fe349c811d03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_60100edb4205e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486193/normal_5fd152d9ad44e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459631/normal_5fcc016a29244.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/3327190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463785/normal_600c7f2897792.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/perurulexi/tawunenijesina.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/3554001397.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/wemexagetujugawepixusiru.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/cultural_genogram_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/14661213032.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/dimabemexigosujapisavori.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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 5896 bytes
SHA-256: be88a2e6514802e7613fa0c70e9a5edb3a392524ea3abe965d8a904c7852e2bd
font_01_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10224 bytes
SHA-256: 6dfef564b3786e735ce1cfcc0cd561afcc74d321ec64741a2bde1205cf63aabe

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