Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a733bbf4ce7d2f…

MALICIOUS

PDF

70.0 KB Created: 2020-11-16 20:05:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 636e4cc38c8cd39c83f5a86feca4d441 SHA-1: 69990eb6c302fd0ba7beb325a3e901156507f89d SHA-256: 83a733bbf4ce7d2f560de6851d90439dbedac2a319c677c8cccda00fe92d2ca5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=casino+8%252F10+fracciones+equivalentes PDF link annotation
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/83783d660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/ccsf_spring_2019_courses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd67fc0-4abd-44f9-994f-6864ad3a00be/86452861876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8486d0-d4f1-4737-a014-ade345bdd102/chen_style_tai_chi_dvd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d405fd01-49b4-4640-ac30-42199d575be0/dufusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4202fcbb-8876-4ae0-af1a-1c2a53b7690a/damajisabufoxaxelodun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb66ee60-2661-462d-bae6-b0ba47791cad/93368902666.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1e04eb-4615-421f-b53c-da55bff4a3fc/gixilujelifewi.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/sufodato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a28ab4b-7d06-44ed-8f22-5484010bb576/bavurebobemimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efad9c04-e983-4292-9c87-ea1075cbd321/25163872335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee6a77b-615c-45e5-a77c-b0e41fbb8b11/36046594944.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b83c54a-ce25-4b9b-88b6-ce84ce5ee7ee/30441520095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ec32cb-9bd8-4f92-8bb2-6b83f8d7b1d1/stt_v_xe_exciter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8b9843-6ac8-4f0c-9297-35022e6b6be7/57908069550.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000bf62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF62 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 5388 bytes
SHA-256: f7f162ed114eb913c6fe8e27ffcc5a815c751b62ba1a7b359543c0597949d56e
font_02_sfnt_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 12816 bytes
SHA-256: bc43f226c0de3c9c973e90edf500566708dd2cbcb18fd974c3576bd14d640eca

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