Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf1aa5a2bfa1ef1…

MALICIOUS

PDF

67.7 KB Created: 2021-02-16 07:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0a6b79f0c66164358547738b704c00bb SHA-1: 84c14449691e2e81d8d65b7589b8967c46ba6d31 SHA-256: bbf1aa5a2bfa1ef1f5750dbbf3af18f72a98fc572a1a3186fb0e4b0f5ff3f93b
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing campaign. The PDF's structure and embedded URLs are consistent with attempts to redirect users to malicious sites for further exploitation or credential harvesting.

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
  • 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://baarspo.ru/wb?keyword=usb%20turntable%20software%20free%20download PDF link annotation
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/pefoja.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/jnOjvjf/7062188495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_5fd67f20e3d05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5fe94ea68d0c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388416/normal_5fde5bc4edf22.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/lezemabeso.pdfIn PDF document text
    • https://cdn.sqhk.co/kurazagizub/jEowhxM/stick_it_in_his_ear_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/C3hi9hj/xitubojebemojaba.pdfIn PDF document text
    • https://cdn.sqhk.co/zexoribuj/gdijZie/new_english_love_songs_list_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5fe36a6df0a03.pdfIn PDF document text
    • https://pazerutafu.weebly.com/uploads/1/3/5/3/135392620/jetoduzezaw.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/8617176.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/zurovajij/acute_coronary_syndrome_guidelines_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/81439828426.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/transformar_de_binario_a_decimal_en_matlab.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/information_about_quaid_e_azam_university_islamabad.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/jetibopasofiz.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/black_and_white_fall_border_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/5917235365.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_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 5124 bytes
SHA-256: 78ae9a3ef77f16bfe3a458d07a87d9ffa4d8ed7b8f318b66c0cc253f9286f33f
font_01_sfnt_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 10072 bytes
SHA-256: b8688075d827e37e0d78d6c5c269816fb3c515dc438001f2a6fc029d14ca1229

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