Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e770b44432c2ad…

MALICIOUS

PDF

78.6 KB Created: 2021-02-20 18:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a78333b23f8e87ba3953b2a41a191f82 SHA-1: dae27326f2a8e632e0938e6fd507c40943add6cf SHA-256: 76e770b44432c2ad215e9e2185c7906aa126094bf4dd175a70cea843a9e2d6c8
156 Risk Score

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 0.9997

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://jacksth.ru/123?utm_term=la+gallina+degollada+resumen+muy+corto PDF link annotation
    • https://xomupufemi.weebly.com/uploads/1/3/4/3/134322732/6396949.pdfIn PDF document text
    • https://tasiwusod.weebly.com/uploads/1/3/5/3/135351817/zanakabokodaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_6020fec32cf0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478687/normal_5fcbf545938c2.pdfIn PDF document text
    • http://bhd-management.space/occupational_therapy_clinics_near_meepkv6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473892/normal_601a0030cb1f8.pdfIn PDF document text
    • https://kuginipa.weebly.com/uploads/1/3/4/8/134853520/3448811.pdfIn PDF document text
    • http://popularchoice.space/vikitirunekopifafojafuiu616.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/zupenafud/kurotadazenepagiro.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/d3_inna_set_dungeon_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/apple_watch_photo_face_template.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/7531295047.pdfIn PDF document text
    • http://bunisanabasa.epizy.com/79591491553.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_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 5300 bytes
SHA-256: f55bf0e1168b65877ebad458fab574e8dfdf8c8a749b36245383078624f2d387
font_01_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 11732 bytes
SHA-256: 4a3cc59c4469c48a9cc0d6ecbf2b13ba0031ed525c6411ed366b9abb555b358e