Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78b6ad95d8217c7…

MALICIOUS

PDF

86.5 KB Created: 2021-03-31 12:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 007dc25ebbffbc5e708d08fffb55a1ae SHA-1: d9a017b2d642a8a80ec306b71468ac1c26911da0 SHA-256: f78b6ad95d8217c7a94381a78a65d5d19108c3d619250d6eb1f5c28b8eff894e
156 Risk Score

Malware Insights

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

This PDF document employs a link farm technique, presenting itself as a free book download to entice users. It contains numerous external links, many pointing to other PDF files, which is characteristic of SEO manipulation for malicious purposes. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload, likely delivered via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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.
  • 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://xajibur.ru/award?keyword=c+s+rao+book+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/riroxale/qYfZgjB/pinkfong_baby_shark_listen.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/bjfhhJu/20786844443.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/Zif4iZm/89020869199.pdfIn PDF document text
    • http://katopikinu.22web.org/tosixiwibavitoz.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/hjciawb/riruloketot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_57d397c627d34fd9bf204cd4398b530d.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_c140aff73a8048bd86b54c697139892f.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_a384c5b5790645bf85262d138f1a465f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/lakamepawajogeresukemab.pdfIn PDF document text
    • http://bovinow.epizy.com/64882139576.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/gosibididovimixubali.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/dezavemozudemaxufudom.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_6fedba61d0df4316a42da3a39449587a.pdf?index=trueIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_2167c5b946e94e28a004d9bc88f22ce2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/alphabetical_order_worksheets_for_class_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/aptoide_install_apkpure.pdfIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_771f1f7519584b129f7b182675f4fd9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/jotobagaxevosepokida.pdfIn PDF document text
    • http://kirogebi.epizy.com/excel_2013_vba_application._worksheetfunction._vlookup.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_44f7b92c4c854accb59fb9b2bdf16310.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/nutakuzulonutifuse.pdfIn PDF document text
    • https://2b075577-062e-477b-ba44-a680027dca12.filesusr.com/ugd/ee943f_493063a1f34c414999fda01186a25369.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/jaxevu.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/ghibli_music_sheet_flute.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/bemepobewaxixozewu.pdfIn PDF document text
    • http://fetevatakipip.epizy.com/xesasovizovudolemekujam.pdfIn PDF document text
    • http://zavipazo.epizy.com/bose_connect_app_not_ing.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 5236 bytes
SHA-256: c5ec63cfeac9f8f821f33df2d8726457f62651915470a4b3ef1102cb546721ac
font_01_sfnt_off00012613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12613 11248 bytes
SHA-256: b218195aa3f5c4a7631324654034d6ac0933835832783764b2a1a6750a71ab10

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