Malicious PDF — malware analysis report

Static analysis result for SHA-256 00e9633cd8825875…

MALICIOUS

PDF

77.1 KB Created: 2021-01-17 22:22:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dc2ab4f95031ae741ad4a97267d9e90 SHA-1: 7f3cfb94aa718e241fe0480e98b39f411163ca2e SHA-256: 00e9633cd88258754243c65e2b902258868940df0628a7045c1a7a61267682f3
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs pointing to external PDF files hosted on various domains, many of which appear to be disposable or used for link farming. One URL, 'https://ggtraff.ru/123?utm_term=i+bite+my+thumb+at+your+limits', is identified as a known malicious redirector. The document's structure and content suggest it is designed to manipulate search engine results or to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.
  • 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://ggtraff.ru/123?utm_term=i+bite+my+thumb+at+your+limits
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/82e3d8745a5791f.pdf
    • https://site-1238423.mozfiles.com/files/1238423/sesimigiwutapujera.pdf
    • https://cdn-cms.f-static.net/uploads/4421336/normal_5fda01bfc6c08.pdf
    • https://cdn-cms.f-static.net/uploads/4385614/normal_5f9154706fc21.pdf
    • https://nulokedebuzeb.weebly.com/uploads/1/3/4/3/134310318/lisajuzamiwelumuxira.pdf
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/sewaginulafeg.pdf
    • https://site-1191564.mozfiles.com/files/1191564/petrolia_weather_underground.pdf
    • https://site-1168006.mozfiles.com/files/1168006/idle_master_chef_tycoon_new_restaurant_games_download.pdf
    • https://static.s123-cdn-static.com/uploads/4530429/normal_5ffd4eff7626b.pdf
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5f9f926448c4f.pdf
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/72023f20cf017.pdf
    • https://majemuxisirilud.weebly.com/uploads/1/3/4/7/134719568/6077335.pdf
    • https://site-1201322.mozfiles.com/files/1201322/rumoxoxivoji.pdf
    • https://cdn.sqhk.co/potasuregoz/iijcoKc/25771062936.pdf
    • https://fotagajumiveba.weebly.com/uploads/1/3/1/4/131411987/wijixoribozolurizu.pdf
    • https://site-1168078.mozfiles.com/files/1168078/50691312244.pdf
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/vawazov-jexobeteg-pebavase.pdf
    • https://zazigiwozaka.weebly.com/uploads/1/3/2/6/132681333/a65a6.pdf
    • https://site-1168130.mozfiles.com/files/1168130/chicago_style_bibliography_format_book.pdf
    • https://cdn.sqhk.co/xetajikok/pxLiiyI/70190224619.pdf
    • https://site-1166067.mozfiles.com/files/1166067/my_verizon_fios_account_number.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f21e.bin
e7f969e0ac26933ecd4797ffde7bb08d35a0ba920d717d742e4df60ccd3948c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 5104 bytes
font_01_sfnt_off00010350.bin
5cb7ca1f5c3f93952f1ed66525783fea95b561fe40419c26082ca1c05096699b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 10488 bytes

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