Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd2576b602e32dea…

MALICIOUS

PDF

84.6 KB Created: 2021-02-16 14:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4f617ffc41ac492976d0962e1f63def6 SHA-1: f165c48f50d31e05bc4e6a62004b9c60cfdb12c7 SHA-256: cd2576b602e32dea192d01b0a393c7ca15b14a7fb3d3acd0854f178c8999f5e2
244 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The primary malicious URL identified is 'https://crophysi.ru/strik?utm_term=place+value+games+4th+grade+free', which is likely used to redirect users to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://crophysi.ru/strik?utm_term=place+value+games+4th+grade+free In PDF document text
    • https://fuwewarudizikip.weebly.com/uploads/1/3/4/6/134644733/7a1be.pdfIn PDF document text
    • https://cdn.sqhk.co/puwukuwos/gcgchbH/9234009868.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/idP37fk/demusotefe.pdfIn PDF document text
    • https://cdn.sqhk.co/diwamukef/huMeZje/17191737567.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/ighjjdP/xejumuzujaxudagisexifufof.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/OihigXG/how_to_play_among_us_on_pc_controls.pdfIn PDF document text
    • http://guzolupe.iblogger.org/rectangular_prism_template.pdfIn PDF document text
    • http://wupupetobuzune.22web.org/nomanobolev.pdfIn PDF document text
    • https://cdn.sqhk.co/xanuramalu/jdjihff/37457746844.pdfIn PDF document text
    • http://zuluwana.iblogger.org/58205651711.pdfIn PDF document text
    • http://fafasun.iblogger.org/quickbooks_premier_link.pdfIn PDF document text
    • http://tanatedafupex.22web.org/nasogastric_aspiration.pdfIn PDF document text
    • https://xizunobalik.weebly.com/uploads/1/3/0/7/130739811/6563714.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fibalikirikoti.epizy.com/gemejago.pdfIn PDF document text
    • http://bavosezema.epizy.com/poradowenekir.pdfIn PDF document text
    • http://vedezaduxi.epizy.com/exchange_activesync_on_android_not_working.pdfIn PDF document text
    • http://birijigasexow.epizy.com/66055750948.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_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 5584 bytes
SHA-256: 878e70dce45f90c34d461920e3e46f74b1fbea937f5b90d67e69827225aae1a4
font_01_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 10560 bytes
SHA-256: 3e316200fdde56a097f448ede1f0a806ec514122212526362336c3dc68de5db8

Open this report in the interactive analyzer, or submit your own file for analysis.