Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4b90fff0afbbec…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 19:05:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 453798f6ddf86a87f34bff6e6cc215b7 SHA-1: 17ca0c4b0f3da2513482dfbbf2bc089767ea03a1 SHA-256: bb4b90fff0afbbec5943ef73f629955a7c3682ca3dd5d38517d735632ada0577
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Weebly and other dynamic DNS services, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the primary goal is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/award?keyword=b+spline+interpolation+pdf
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/a3954caf.pdf
    • http://zatoboyvibor.fun/1522847323604ih1.pdf
    • https://xepezexitig.weebly.com/uploads/1/3/0/9/130969834/guxovopot.pdf
    • http://moneymaya.site/color_my_world_chicago_flute_sheet_musicogyp2.pdf
    • https://depopuxa.weebly.com/uploads/1/3/4/8/134893869/doxigase.pdf
    • https://vozunekoba.weebly.com/uploads/1/3/4/9/134902797/3d6c5f92b9fee8.pdf
    • http://mybiol.site/60328904305le4hp.pdf
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/jizazijubugerutinasu.pdf
    • http://fepotarugagi.22web.org/73993501170.pdf
    • http://talerexogite.iblogger.org/atari_800xe_manual.pdf
    • http://opssmall.space/brace_yourself_meme_template2le6g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rogugagatuf/free_uc_browser_for_windows_xp.pdf
    • https://s3.amazonaws.com/nefomojuwet/shukran_ya_rabbi_shukran_naat.pdf
    • https://s3.amazonaws.com/bajapovogam/supimuxobiwetijapufifele.pdf
    • https://s3.amazonaws.com/mipizaju/46148971311.pdf
    • https://uploads.strikinglycdn.com/files/fa3bcab0-c0ac-45e3-aa44-6e9721aec034/todokofoxefunofode.pdf
    • https://s3.amazonaws.com/tadevewuju/balance_sheet_liabilities_order.pdf
    • http://juxudawalugevop.epizy.com/vezaxifulanogulanal.pdf
    • https://uploads.strikinglycdn.com/files/5a4ba334-fb82-406d-8d42-1611f7c92f7d/panalovubawobelemedi.pdf
    • https://s3.amazonaws.com/zubata/18088036846.pdf
    • https://s3.amazonaws.com/wefemabeni/subtracting_decimals_word_problems_worksheet.pdf
    • https://s3.amazonaws.com/dapekufoxiraku/altered_carbon_book_parents_guide.pdf
    • http://pezuxegoweniger.epizy.com/sonozidikatukagix.pdf
    • http://sulegezusaz.epizy.com/51779747703.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e602.bin
492994a41cee65194b94f54923ce69ef9701450338c5b7e382c6e4235fe69775		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 5084 bytes
font_01_sfnt_off0000f75b.bin
c8a9467c22b90cfa006da90bf8de0649a02da55626b4633396445e31c3cf695d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 11436 bytes

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