Malicious PDF — malware analysis report

Static analysis result for SHA-256 032fda0c2955b38b…

MALICIOUS

PDF

86.4 KB Created: 2021-05-19 22:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9e70c70d806e67849aabf6e7bae81a21 SHA-1: 25175cfdf0417ce1ca285f21ac52af2929ebbbaf SHA-256: 032fda0c2955b38bae57798456eb4c0fc47d4f7c984709c659d866a22163d8c4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of a large number of external links, specifically a 'PDF link farm', suggests a tactic to distribute malicious content or manipulate search engine results. While no scripts were extracted, the PDF structure and external links point towards a phishing or SEO spam attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=how+do+you+treat+intermittent+explosive+disorder PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421335/normal_60079988bbf5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_604156bdef05d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_603416e5427b1.pdfIn PDF document text
    • https://piramejujidizek.weebly.com/uploads/1/3/4/6/134694247/memiwunibalapil_vupunelit_gedukigunusuxow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464529/normal_6001922fbf291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462726/normal_6054bcf25a60d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_602c5a4793c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_6045c07b09066.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/c1a8b5f138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500199/normal_603e92a634237.pdfIn PDF document text
    • https://zifosugelupoz.weebly.com/uploads/1/3/4/6/134693972/masuwimod_rojut_wekanuje_duxawukajepileg.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://uploads.strikinglycdn.com/files/807ac2c2-fc80-4f28-bfe0-8a472c7216d7/36144554519.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/8007365632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d994f0-731c-4311-9c99-87899173c339/24547677345.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/2007_chevy_impala_battery_light_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/faed08ab-90df-4832-9796-3eb1babbb20a/fafugoduwadoxurexenaw.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_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 5272 bytes
SHA-256: ae5ced1064fa8162e83069297506a8338566459997df8bcde0c595864c3e6aea
font_01_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 11360 bytes
SHA-256: 884ad906dbde4b51cf1c58ec7ab91487f18b84b50f095e908eda590bddaf1723
font_02_sfnt_off00013e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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