Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06771c8b7abc9af…

MALICIOUS

PDF

77.8 KB Created: 2021-03-20 03:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 83cd50467d15a013b2e2aa6950e9277f SHA-1: b3676461a378eb3717723714cbca101e5975b72d SHA-256: b06771c8b7abc9af50decd6db1cdb528431b0ecc31aa68419042db1a14119fd8
244 Risk Score

Malware Insights

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

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, many of which point to disposable hosting and redirectors, suggesting a link farm designed to distribute malware or conduct phishing. The primary malicious URL identified is https://yafferge.ru/strik?utm_term=motorola+radio+ht750+manual, which is flagged as a known malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://yafferge.ru/strik?utm_term=motorola+radio+ht750+manual In PDF document text
    • https://butavuzi.weebly.com/uploads/1/3/2/6/132682386/wejozikodig.pdfIn PDF document text
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/5070365.pdfIn PDF document text
    • https://lerinaxupol.weebly.com/uploads/1/3/4/6/134662503/1ea3c6bbf097d4f.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/hGigkia/chemical_bonding_intermolecular_forces_worksheet.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/fd4a6.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/4647405.pdfIn PDF document text
    • https://wijugola.weebly.com/uploads/1/3/2/3/132303023/22402f8d.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/wisukasogubifir.pdfIn PDF document text
    • https://monotuwisax.weebly.com/uploads/1/3/4/5/134589760/2009290.pdfIn PDF document text
    • https://genefitagujutun.weebly.com/uploads/1/3/5/3/135392589/bb40f2e9f.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/Hqoichh/superhex._io_zoom_hack.pdfIn PDF document text
    • http://gezetola.scienceontheweb.net/como_funciona_la_energia_eolica.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/heifhfx/zojepir.pdfIn PDF document text
    • http://nuwetiveguvo.mypressonline.com/is_vizio_model_e420-b1_a_smart_tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_0c3f7de125b04329b73e12843047172f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/uniforme_del_borussia_dortmund_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/gilozonipizekagisokedepix.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_dcbed73ed77b4956a7d1038166532ddf.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_958638a178df4356b43c4bc07f7e3040.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/granny_mod_apk_invisible_android_1.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/sundance_film_festival_2019_program_guide.pdfIn PDF document text
    • https://9f2a6cc1-6e15-4467-beaa-57274ca996ed.filesusr.com/ugd/78f4c3_04301c9dd6ad477ca70dfbdd1c102165.pdf?index=trueIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_f4dc19eb2bdb40e1b392e4d3c0a5be82.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_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 5236 bytes
SHA-256: 2311a98c73675f104c9c25645204b664381909b42dd04a74fe3b819a28b3fa40
font_01_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 11620 bytes
SHA-256: 04b7274e5e70f7e62e3f3a203b381b7fd7da99e0f1c87a14e2bf888b39c62e04

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