Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d16aff3ff025861…

MALICIOUS

PDF

126.4 KB Created: 2021-04-29 20:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe149b628883ccbdd425c15cbd44481a SHA-1: afa05d7ff5da6b5e99d11770d8502a894463d2d8 SHA-256: 9d16aff3ff02586142e1522d0bae8ed6334d69f5a679da63b306c488dd26981f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary malicious URL identified is https://crophysi.ru/strik?utm_term=daily+english+speaking+part+1+pdf. The document's content is likely a lure to trick users into clicking these links, which could lead to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=daily+english+speaking+part+1+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_606842f12ef7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6049e49965f23.pdfIn PDF document text
    • https://baxemazone.weebly.com/uploads/1/3/0/7/130739829/fagezilezik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485157/normal_5ffc680f573b8.pdfIn PDF document text
    • http://dejamorije.scienceontheweb.net/bmw_x5_2020_brochure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450635/normal_5fe8bd6c9a309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_601e389c54632.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_6060444f3b53e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_601791bed901b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_6064ecae4d309.pdfIn PDF document text
    • http://gililofus.medianewsonline.com/pilot_aptitude_battery_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_603c2feb3c23e.pdfIn PDF document text
    • https://nirixebuwema.weebly.com/uploads/1/3/5/9/135990662/musapigupenex-kasidedurikeva.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473622/normal_5fe357ae5fdbd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5862e4ea-63a6-4c92-af93-e06d02d1a664.filesusr.com/ugd/eaa371_7b3f3e01fe6647c1bf7078eda6822199.pdf?index=trueIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_6d6d8b3a3d6046adaf1eeeb7cd0ff1b7.pdf?index=trueIn PDF document text
    • https://bed2724e-b6a4-42c6-a365-5b2dc6a82e2f.filesusr.com/ugd/9f087b_87b8d9ba0b3943acb430d0ddbc27e599.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_f91a37d3b0f64f4aa3caebe9fa883803.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_f89ad46ca048451f8b6e7c6b3e6f9f61.pdf?index=trueIn PDF document text
    • http://matewedidoxeber.onlinewebshop.net/11384395484.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_ce35a0eff094428590536c302bdd501a.pdf?index=trueIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_0deb1f643cd344d29bd669e83110a543.pdf?index=trueIn PDF document text
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_6cf8a58f530d4bc993b06a6baa956cef.pdf?index=trueIn PDF document text
    • http://peruroz.onlinewebshop.net/30680713827.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_9313f22ee04045ddb8fc7231c104cbb5.pdf?index=trueIn 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_off0001b295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B295 5520 bytes
SHA-256: 2833c3fe49cbe6057c7ef0c8928faac60fcde435d2837ac328a650737de4bc4f
font_01_sfnt_off0001c56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C56C 11248 bytes
SHA-256: d2752c57e18d0dfac1ca7695ae31ec137c8901de2c51e2701cddc4699053f4b7