Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40eb938531dfb0f…

MALICIOUS

PDF

95.9 KB Created: 2021-04-02 22:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b48662c574c19452057ae2e598288e70 SHA-1: 8f2c5b18223cf713a9f522eb24b0a0a96e761e9c SHA-256: d40eb938531dfb0f9005813f928d7c8d2941485293b7d3be6cae270b3366c1a1
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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=google+translate+chinese+characters+camera In PDF document text
    • http://jawixogu.mygamesonline.org/76849896503.pdfIn PDF document text
    • http://vezemif.22web.org/11430150169.pdfIn PDF document text
    • http://fizarumokugafu.mywebcommunity.org/59910350875.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/ahdidjh/ultimate_dragon_simulator_apk_indir.pdfIn PDF document text
    • http://guvupokive.iblogger.org/battle_royale_manga_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/31jcqo6/steam_tools_mobile_app_wishlist.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://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_b39d655ae98d4bf9a77f10d1e3c631ab.pdf?index=trueIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/retiwiwuketajujugut.pdfIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_71e9be9b0ff64153b1d1a9052ed16e4f.pdf?index=trueIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_6ee3b8c7598d4004953c966c4cee752a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5143465e-e20a-43d6-93dd-fd5dbbdcd011/why_is_it_important_to_critique_an_article.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/zojuwujagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a673b8f2-6991-4782-bdf5-815cf4d4fa3a/joramelinifolafud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8807119c-8e0c-4ad6-913b-cafdb31f20b0/86125701553.pdfIn PDF document text
    • http://vimomata.rf.gd/71075649393.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/7711849121.pdfIn PDF document text
    • http://mujigakevomo.epizy.com/5th_grade_mental_math_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbb845d5-5ce0-40bb-8b38-9cc246e98388/saga_graphic_novel_volume_11.pdfIn PDF document text
    • http://bupineweso.rf.gd/lujefazaxenabukevu.pdfIn PDF document text
    • http://wasizematimom.rf.gd/xopotesepijofipotuje.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_80f0e07a43bb4747ab4f4419dfd09173.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C4 11984 bytes
SHA-256: ab5c1b7a11e907968fe5479df3cf2d5d8b4a32c145b8dd615fc1aa57a0553745
font_01_sfnt_off000128b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B2 5032 bytes
SHA-256: 864c4b8a5e42b7cd4f1f427fdeabd3ce7b21319623cf9aa58fcd8bd7b7f0eebd
font_02_sfnt_off0001399b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399B 12096 bytes
SHA-256: 86ae1587c56f012dd27796b08bc96fa580b661350e13cebb0ea2f8c3869f402e
font_03_sfnt_off000161d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361