Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec8f663ab2b1e66…

MALICIOUS

PDF

76.3 KB Created: 2021-03-04 03:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 14e7d44e7dea779cdb7da55016d12d7e SHA-1: 9d1e69acff093f243dcef114af0eda8b69442b14 SHA-256: dec8f663ab2b1e6666e2108bf8f044c5fa9068794df0ba038fb4d93a0c4ca440
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, exhibiting a malformed exploit stream. It contains numerous URLs, including one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded content, though heavily obfuscated, likely facilitates the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://jumiwimov.ru/wb?keyword=king%20strength%20to%20love%201963 PDF link annotation
    • http://ch-data-2a8fv9s.pw/26633589285zspc1.pdfIn PDF document text
    • https://loxujonukirurob.weebly.com/uploads/1/3/0/7/130776454/puzenabijome.pdfIn PDF document text
    • https://rijozixofufake.weebly.com/uploads/1/3/4/5/134509282/kedesiridunorevapin.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/the_kitchen_big_game_changers_recipes.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/wugugukosujakekojupitije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_5fdc6e7d05504.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/0b68423a.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/36839618899.pdfIn PDF document text
    • http://astropsychology.website/baby_leotard_pattern9xwpl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_602a6f465c42a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_603f8c04a717f.pdfIn PDF document text
    • http://avtoshtorki.shop/jiwekogiginolotogsc40s.pdfIn PDF document text
    • http://datinge.site/livros_de_culinaria_em_gratisaqi6f.pdfIn PDF document text
    • http://ketotreno.buzz/49527029744i2ufd.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/76330200317.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/wonumafubij/vesomixe.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/nurse_manager_behavioral_interview_questions_and_answers.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5292 bytes
SHA-256: 83c164e9eb54f73bf0769f55a2fe7a3a699939dda78d3bb05c6fd7686d449677
font_01_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 11140 bytes
SHA-256: f49d30e602e5ac027670097d23fc7ea0b8c8b2fd9653bc58e7c765a6185450e1

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