Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0eb61472a45455…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 18:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 148422884cecdb135965617527663769 SHA-1: 89c5e085d848fa08956ebee9353d54c225f5700b SHA-256: 8e0eb61472a454552c669bd6587bd12d91657f975eb5c3e6039cc8ebb3e5f279
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to drive traffic to malicious or spam websites. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the presence of embedded URLs points to the document's primary function of redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=transformation+of+trig+functions+worksheet+answers
    • https://static.s123-cdn-static.com/uploads/4479454/normal_5fe3ec00129c4.pdf
    • https://static.s123-cdn-static.com/uploads/4459035/normal_600898639d6de.pdf
    • https://cdn-cms.f-static.net/uploads/4417406/normal_60212f7788c8e.pdf
    • http://disozire.mygamesonline.org/35750141019.pdf
    • https://cdn-cms.f-static.net/uploads/4379851/normal_603599b5ca4a6.pdf
    • http://dimopun.mywebcommunity.org/murejazasexasiditut.pdf
    • https://kedigijolaga.weebly.com/uploads/1/3/4/3/134331451/1317010.pdf
    • http://saporik.scienceontheweb.net/fefumaxazixuwazafazitad.pdf
    • http://kuliwegi.sportsontheweb.net/tempest_act_2_and_3_summary.pdf
    • http://suberubepuparo.getenjoyment.net/ge_cordless_phone_with_answering_machine.pdf
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5fcbee62e5b71.pdf
    • https://sajesugepila.weebly.com/uploads/1/3/4/4/134467456/b24e9e46252.pdf
    • http://pogekoxuw.mygamesonline.org/apertura_de_credito.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_7062f7312e314748866c3357c596e63f.pdf?index=true
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_8b73fed96a91472282cfdca837edecf5.pdf?index=true
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_2ba894aff9ce45e7820009dd84e7af44.pdf?index=true
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_29240b40aee1461c964ca129d1182bb3.pdf?index=true
    • http://ketabigumowun.atwebpages.com/68045000540.pdf
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_89e313bf17b04a808f495a3675e0d778.pdf?index=true
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_dc02eeb2cc9142f0b8cc3aae04aa3020.pdf?index=true
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_39e663b8999349f6998d0c666c5992b5.pdf?index=true
    • https://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_3bfc187cb9c6429e8b3214b4fae3d8c3.pdf?index=true
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_f8500deb8e2a4864bf62724b2d344b0b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f614.bin
b7c578315cbc5e771f5b762d53d00d8da9d382c882cafefafebb9565958023d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 5368 bytes
font_01_sfnt_off00010844.bin
4ee9a7d7f18046e735f88c001eb0d1cc19e2c1550f118a1cfbafc0509e29521a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10844 10872 bytes

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