Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf97af334a66da1d…

MALICIOUS

PDF

75.1 KB Created: 2021-02-24 18:33:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9119abbb32840ea307b3e8f2b825e0e8 SHA-1: 298dbdeb12294260cd031115c807d5b2ef6ba644 SHA-256: bf97af334a66da1dad7fab2cbf553e0ed1997ab74c769a1456af905c3bd2b1bc
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous external URIs, with one pointing to 'maypoin.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying the document as a link farm on disposable hosting, likely intended to obscure the true malicious destination.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/strik?utm_term=trigonometry+for+dummies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381546/normal_5fdc1d3e739c0.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/how_to_charge_your_jlab_wireless_earbuds.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/reliability_centered_maintenance_training_uk.pdfIn PDF document text
    • https://monowulesamewul.weebly.com/uploads/1/3/2/6/132682048/xojiwot.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/does_the_lexus_hybrid_require_premium_gas.pdfIn PDF document text
    • https://timifuxi.weebly.com/uploads/1/3/4/6/134676324/madip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_6023f5cf552e3.pdfIn PDF document text
    • https://tuxufinuzeleki.weebly.com/uploads/1/3/4/7/134737217/pejogodoxuxorowuxon.pdfIn PDF document text
    • https://zaniwobomivefo.weebly.com/uploads/1/3/1/4/131406480/kejajisimozona-duwarut-tiguletesunakun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374178/normal_5fe16cb384907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_600d28a2cf308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_60328b1885061.pdfIn PDF document text
    • https://firunonosud.weebly.com/uploads/1/3/6/0/136052948/fimoguvafakefegim.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/xixonu/what_is_wifi_speed_ac1200.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/gavebogutusog.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/40478035166.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/emt_exam_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/30420564770.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_off0000ea55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA55 5036 bytes
SHA-256: a7bccc5eff9229b0c83c21c6dd3e7bb7b8098448f1f24ecb1fdc89d42cce7976
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10400 bytes
SHA-256: bd76c1ffc69e303a5e246498255ee08bd6e9f9766219d7d8d24a3c340a7adc89

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