Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f9cdffdb897632…

MALICIOUS

PDF

79.6 KB Created: 2021-04-21 15:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 8afbe5ea249ee56855fed6d938baf76c SHA-1: a25b18f2ff238aa093a8211b53b69eea4673262d SHA-256: 43f9cdffdb89763209d4fadb6b457cc5215528c98958f584b6271e4960e42174
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/strik?utm_term=poetry+analysis+the+negro+speaks+of+rivers PDF link annotation
    • https://cdn.sqhk.co/bokirebi/whcgdih/space_required_for_air_hockey_tables.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/Bg8gdhg/top_20_songs_2020_rap.pdfIn PDF document text
    • http://kesisekojabaz.iblogger.org/calendar_november_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/remavaveso/Vij3fha/3d_paper_cut_art.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/a7tgems/pes_club_manager_online_apk_offline_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/fCagh33/4415370166.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://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_6be3982510ff419997d51dba6da6b31d.pdf?index=trueIn PDF document text
    • http://tolamepaduxeju.rf.gd/mobagafem.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_62c03b26fe024b099d06a3c7cd35881e.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_328adb795f404a13b25f441497b575ed.pdf?index=trueIn PDF document text
    • http://jilafix.epizy.com/wuwodasudiwojokutumepejuf.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_fe74f8c0877d419ea6758e06d03e4b54.pdf?index=trueIn PDF document text
    • http://danofef.rf.gd/kidoje.pdfIn PDF document text
    • http://jatomadot.rf.gd/66070836429.pdfIn PDF document text
    • http://jufawananifufa.rf.gd/newavezovabowovutamolama.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ae63d2-c1f4-4a4e-8bff-1588ffdcae2a/63375474400.pdfIn PDF document text
    • http://mujozitovisiwud.rf.gd/23130488430.pdfIn PDF document text
    • http://merijimiz.epizy.com/49088473475.pdfIn PDF document text
    • http://nomulumipal.rf.gd/37490233059.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_901f9a4a448648e2836c5f14e881de2a.pdf?index=trueIn PDF document text
    • https://4bbf79d8-97e4-42de-9a75-948158c354f0.filesusr.com/ugd/52f5d3_d683291df4b44f49812e7d7fb405dfb9.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_c01cb8ff1de6453e96a8bd730bde441e.pdf?index=trueIn PDF document text
    • http://biponutagovom.rf.gd/belekusevinokunipudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642f9f42-7d19-4d4f-86ec-2fd8c4c5ac3c/covalent_ionic_bonding_worksheet_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 5176 bytes
SHA-256: 47e8bb144a52249a4f96e70473a5a79c89d574d1bba47c7c7ba201dbd9a31b96
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 10888 bytes
SHA-256: 5b23d21df6e102c64feeb206eb1f7cec978c1a62e09f866d23bb007aec223bac
font_02_sfnt_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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