Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c3e6c657a656cb…

MALICIOUS

PDF

94.5 KB Created: 2021-02-22 06:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a057e583e35a653ebb7ec82f559d6f52 SHA-1: 83aa3e8778ec024a40f922c68d69813ae82012d5 SHA-256: 83c3e6c657a656cb1de5761099a2178cdf3136b166b5a7ff9d7a7e5cb66165cb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=what+type+of+nitrogenous+base+is+not+found+in+dna PDF link annotation
    • http://yellownatural.space/how_to_reverse_data_order_in_excel_graphn1jp6.pdfIn PDF document text
    • http://gdztut.com/sopa_de_letras_computaciond62tw.pdfIn PDF document text
    • http://eroganoficial.site/587212185367oyq8.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/yidjhjZ/clash_of_clans_mod_apk_download_coc_hack.pdfIn PDF document text
    • http://visiblawty.com/bible_quiz_questions_and_answersfn44w.pdfIn PDF document text
    • https://cdn.sqhk.co/luxixumogez/NpNhdCR/xizomaniboxub.pdfIn PDF document text
    • http://golosa-spasibo.ru/formatos_para_reportes_gerencialesrqbh0.pdfIn PDF document text
    • https://cdn.sqhk.co/bavimimo/Vjfhdlq/31292390557.pdfIn PDF document text
    • http://all-system7.xyz/dapunojudz18m9.pdfIn PDF document text
    • https://fuvetowonilup.weebly.com/uploads/1/3/1/3/131383456/xafuzat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunaraxanoxun.epizy.com/glue_for_sheet_metal_to_wood.pdfIn PDF document text
    • http://gadiwovujema.epizy.com/android_9_pc_windows_10.pdfIn PDF document text
    • http://resegubus.rf.gd/zukawivuwara.pdfIn PDF document text
    • http://joxumokuri.epizy.com/bluetooth_software_for_laptop.pdfIn PDF document text
    • http://ketoxuxun.epizy.com/what_is_a_man_called_in_spanish.pdfIn PDF document text
    • http://zopiselewanut.epizy.com/non_stemi_guidelines_esc.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_off000131c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C6 5528 bytes
SHA-256: c86b7c3c8ca079bed868b3c9ec37b8348c4e8478fe3e55eca90d6703c8bb8233
font_01_sfnt_off000144a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A0 12052 bytes
SHA-256: be997551f32ca467df655bbb5fe9559edc724b35520b215fa8d8e4ab0eea67fa

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