Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e2ae0e70befbe2…

MALICIOUS

PDF

78.2 KB Created: 2021-03-09 04:12:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 01b28cbe5f6b9f136e8383930cc10a77 SHA-1: 2fe7947d35642b9e782285074bf27b29d9f99ae6 SHA-256: 90e2ae0e70befbe23112dfef33902a05bab7184d953053f75a9aaeaa2d288678
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting or unknown reputation sites, suggesting a link farm or download lure. The document body, though heavily obfuscated, references 'wkhtmltopdf' and a textbook download, aligning with a phishing pretext to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/award?keyword=textbook+of+medical+oncology+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/janimivaxo/kgi8igj/followers_hashtags_instagram_2020.pdfIn PDF document text
    • http://meetchat.space/286529509531k32i.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/Liiidhg/zaxiwizapexewajix.pdfIn PDF document text
    • http://circulshtangcalip.website/how_to_find_magnitude_of_normal_force_on_an_inclinentrpc.pdfIn PDF document text
    • http://mattelipsticks.site/sowalowebepudabozidepthez1.pdfIn PDF document text
    • https://cdn.sqhk.co/domuduxuro/jg4S076/plague_m._d.pdfIn PDF document text
    • https://cdn.sqhk.co/ribovonubod/eJgfJcK/misef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dedalumakur.epizy.com/inside_reading_answer_key_vk.pdfIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_0be779a760ba4852a2c9894145708435.pdf?index=trueIn PDF document text
    • https://c92c3cbd-aa1a-4a47-9f3e-f582eeca1925.filesusr.com/ugd/89b1bc_7573914a1085476eaef3017c3354fd88.pdf?index=trueIn PDF document text
    • http://nerokigonone.rf.gd/chaldean_numerology_for_beginners_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/business_report_template_word_2010.pdfIn PDF document text
    • http://zonigeki.rf.gd/757650480.pdfIn PDF document text
    • http://xuwanozofugis.epizy.com/85222035438.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/62646859331.pdfIn PDF document text
    • http://fepavipa.epizy.com/81375511738.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/60427909016.pdfIn PDF document text
    • http://xafonabikox.rf.gd/simadufaj.pdfIn PDF document text
    • http://rusavuwirajul.rf.gd/19463464106.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/98260957336.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/fuentes_de_informacion_audiovisuales_ejemplos.pdfIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_f257ffc2192f4a1aa83ae6387a6f99bb.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_c80093c96eb048999a8ec688cb8b7de9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/96083994777.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_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 5712 bytes
SHA-256: e5208b69c5d99a6b6413c8fc4bcf4268ee7844888723477890f452176c766e70
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 11856 bytes
SHA-256: d78951e8bd6bc145f7a3ce19307c4fbaa67831863c8ccd0d4c38a400901651f9

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