Malicious PDF — malware analysis report

Static analysis result for SHA-256 80348f2383360283…

MALICIOUS

PDF

89.9 KB Created: 2021-03-06 05:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b94b926737e07d7268901dc5392f79f9 SHA-1: b7bedcb947b4123c4486695e84df3bf8cf017cfc SHA-256: 80348f2383360283f72d4090e4c5c010e7ee24a60f84833d758910dba38e0fa2
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used to redirect users to malicious websites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' confirm the link-farming behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://lozipotod.ru/strik?utm_term=what+to+eat+to+lose+weight+vegetarian PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447267/normal_600f05beb3542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447630/normal_602c330c38b9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5fcf0e5b89c09.pdfIn PDF document text
    • http://firejifanop.iblogger.org/how_do_i_change_the_lightbulb_in_my_kitchenaid_microwave.pdfIn PDF document text
    • http://wozutujetotox.iblogger.org/vubewugewifuwura.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_602bde6b6768c.pdfIn PDF document text
    • http://vasezasu.22web.org/feedback_form_for_parents_workshop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406782/normal_5fc6572439022.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://28487699-8e1b-430a-a1d4-fe6adda630b1.filesusr.com/ugd/79e5df_6613e2daa52946ae9bebdc36537406a9.pdf?index=trueIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_b5ef4af1e47d470783e40bd46c6b9da2.pdf?index=trueIn PDF document text
    • http://rufejawat.epizy.com/weather_report_for_nyc_this_weekend.pdfIn PDF document text
    • http://rukojipunuwupur.epizy.com/83239753431.pdfIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_c181a230ac574b8790ce825c72385f68.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_8c7a323a165444a6afc2d546ec05c620.pdf?index=trueIn PDF document text
    • http://zifopodisinuri.rf.gd/parujovezodajenamalug.pdfIn PDF document text
    • http://zujexig.epizy.com/pine_tree_3d_model_free.pdfIn PDF document text
    • http://botasalipigu.epizy.com/63521279193.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_05c9d209dbf4447583f9755e692e3041.pdf?index=trueIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_158a86890d9d419d8f730b333ead12b8.pdf?index=trueIn PDF document text
    • http://pavulavusutiki.rf.gd/liftmaster_keypad_troubleshooting_guide.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_0c7274d5f42946b9afa9beb0fd1fd1f6.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_b2631ccd59a54529a8add61ffb6642e7.pdf?index=trueIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_03c7bf166b4149ea993614da6faae30d.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_0b889bfb365a44ed865971cee366797c.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_b441697a71da442eb96a335cec83e2dc.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_f5e000974f394b77a1d15baef275cb83.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_0fd18958177d47eb907062055b49a973.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 4900 bytes
SHA-256: 4aefe5b74ac435c55335ac38b3932b030ac1366d8fb90ff42585fdcb3ed7233a
font_01_sfnt_off0001278d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278D 10748 bytes
SHA-256: 6aaf095eea64951f3eae61aa72e458716eb815d9eb288d939965272cc8372f72
font_02_sfnt_off00014b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e