Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a55839d20c766e2…

MALICIOUS

PDF

68.0 KB Created: 2021-03-03 01:12:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: be28afdca9d1387ec72650982fbea013 SHA-1: 6c76fa34c6fbd6b003ecaf65fe2d85da2178ea8c SHA-256: 0a55839d20c766e2c279bea870af53e1aed6ca09dd4340255621abb8cbc7b83a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

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://gimoguvi.ru/wix?keyword=chicken+coops+for+sale+craigslist+mn PDF link annotation
    • https://kumobavogi.weebly.com/uploads/1/3/2/3/132303339/bofajiwuduga-ridurufe-gewos-kugir.pdfIn PDF document text
    • https://damesijegimu.weebly.com/uploads/1/3/4/6/134624484/kunerosatadot.pdfIn PDF document text
    • http://sevagawos.getenjoyment.net/resnick_halliday_krane_solutions_volume_2.pdfIn PDF document text
    • https://famalekirujapa.weebly.com/uploads/1/3/1/4/131453917/pefazuverakafi.pdfIn PDF document text
    • https://soxuwewoduxewu.weebly.com/uploads/1/3/4/0/134042667/kafoposuke.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/how_to_use_ryobi_pressure_washer_with_soap.pdfIn PDF document text
    • https://punujagenak.weebly.com/uploads/1/3/0/7/130775029/ridizijes_konusumiso_gepedilotexow.pdfIn PDF document text
    • http://pubomoxagu.22web.org/bacci_pizzeria_nutrition_information.pdfIn PDF document text
    • http://posoxazizemates.22web.org/interview_questions_and_answers_for_nursing_training_college_in_ghana.pdfIn PDF document text
    • http://zulurasovuguloz.66ghz.com/85705204464.pdfIn PDF document text
    • https://wesarifalonaba.weebly.com/uploads/1/3/5/9/135961423/393284.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/gewuwasi/vukolajikejemepavifuzuk.pdfIn PDF document text
    • http://davutawopoban.epizy.com/pafipesu.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/pukosamabusuf.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/tuvudejol.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/14227704206.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/xazerox.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_off0000cd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD68 5400 bytes
SHA-256: b194290e19ff751b7672b732a59184dde6d08be3d7a14cf7ee53a959d8e30ea0
font_01_sfnt_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 10196 bytes
SHA-256: 970d0eb1be8a402209bd1734a4f9d2526e5f37def341f975c5a6c39c95b8fa8f

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