Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeb6f3af22a9b734…

MALICIOUS

PDF

85.3 KB Created: 2021-05-06 04:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8212df27dfe14f9b1f86ae259d6a1721 SHA-1: e930501f4c16064186e786a5d5a5774e0c637bd8 SHA-256: aeb6f3af22a9b734d0246e5dd2daa987627750f4945ba6502899b77c57420dac
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically identified as a phishing trojan. The embedded URLs are likely used to redirect users to malicious websites for further exploitation or credential harvesting.

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
  • 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://botokaw.ru/strik?utm_term=avaya+partner+18d+phone+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445343/normal_604b9b5604d26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411490/normal_5fcb2cb2b785a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447273/normal_6049a50431f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_6068dbf95facd.pdfIn PDF document text
    • http://hamlikjorettoop.ru/57931716370yubva.pdfIn PDF document text
    • http://ideal-it.fun/72938400220zawge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_602f71a5e3b8e.pdfIn PDF document text
    • http://yatvoyya.fun/100690982416j1zp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://gurebuvijo.epizy.com/piloxupom.pdfIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_fb02d3be004d492e84d27ea7dc8890b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/jasonunivupeke.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/kagapurekafutubopek.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/walgreens_deluxe_wrist_blood_pressure_monitor_instructions.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_ad2c546cf7d042b580d6d2edaf0d3982.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/kemenuronizufavejugemux.pdfIn PDF document text
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_867375e49aeb418e8e2deb8ad21df3ad.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_334dc57ef5ab4c7586a0b7a92aacea50.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/ejercicios_de_estadstica_para_primaria.pdfIn PDF document text
    • http://leximadibiwojid.epizy.com/sundance_spa_parts_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/jefon.pdfIn PDF document text
    • http://setowibuvi.epizy.com/guidera_court_rooming_house_dallas_tx.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 5412 bytes
SHA-256: a2a9bd0db077f01c583e8bfdfcc449cdcd775697f8857304b64bd93fba522cf7
font_01_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 6096 bytes
SHA-256: 400d97edd7ebc843938de3cdab2b555a1328d60cd0154915083304386710c093
font_02_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 11184 bytes
SHA-256: cf409a905a2f1a55eabb874d7320a05c1ccfc8484fb607a17a49b3a122257462
font_03_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 18216 bytes
SHA-256: 5810e3e5080eb7ff90aca3c59ee358a185582128d888a3f5df86b2342ff884a1

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