Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b870e8b998de2cd…

MALICIOUS

PDF

99.6 KB Created: 2021-03-29 08:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 045e8d502db3a1f49d7e95b489e05bcc SHA-1: efc1737ac722fc54c02f7710354e19f20b5dbe6c SHA-256: 6b870e8b998de2cdc63821bddd33cf34c6118e2c94f0c02bc9b00c48d6362196
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though partially corrupted, appears to be a lure related to academic material, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://vilenefex.ru/award?keyword=apostol+calculus+volume+1+pdf PDF link annotation
    • https://wituxilozixataw.weebly.com/uploads/1/3/5/3/135317309/6275560.pdfIn PDF document text
    • http://bigakeka.iblogger.org/convertir_de_pulgadas_a_centimetros_cubicos.pdfIn PDF document text
    • https://cdn.sqhk.co/foxuninulini/ihjjlvW/minokenabukisonepulenew.pdfIn PDF document text
    • http://banquepopulaire-fr.org/methodology_of_the_oppressed7znzw.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/carcinoma_basocelular_tratamiento.pdfIn PDF document text
    • https://lazoseroli.weebly.com/uploads/1/3/5/3/135316949/gedejenusamu.pdfIn PDF document text
    • https://wuxavuzipirugud.weebly.com/uploads/1/3/4/0/134012349/7793637.pdfIn PDF document text
    • http://vashastrahovka24.ru/binigudapolarazavosobak853g0.pdfIn PDF document text
    • http://sibiwuketilivi.22web.org/17th_amendment_in_constitution_of_pakistan.pdfIn PDF document text
    • http://mufajaku.medianewsonline.com/57969797721.pdfIn PDF document text
    • http://aduo5.online/29821943545be7wf.pdfIn PDF document text
    • https://cdn.sqhk.co/xifinelire/jTSVXih/anonymous_face_mask_2_day_shipping.pdfIn PDF document text
    • https://zusavakaki.weebly.com/uploads/1/3/0/8/130815140/1cfb5c844.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/91518915437.pdfIn PDF document text
    • http://rurebafib.onlinewebshop.net/nutritional_anthropology.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/xuwukunigape.pdfIn PDF document text
    • http://bupiver.rf.gd/zegudojonejumozesif.pdfIn PDF document text
    • http://jasosuwer.epizy.com/46429645418.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 24236 bytes
SHA-256: 116ae8db0d7b6e963d2e2687234880ffe756d6e829a26aee4ef5ef6446ea23fc
font_01_sfnt_off00013a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 5032 bytes
SHA-256: 75e167b8213bd4cf370b806f5bf3e27c60870efbbab10814a8db11538b05e680
font_02_sfnt_off00014b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B69 10920 bytes
SHA-256: 30a6968c285e7eeef351dcd7c2889fe0df56bdbedcb88d203d6d618f8922a9c4
font_03_sfnt_off000170ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170EA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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