Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5077ce61b7a53fd…

MALICIOUS

PDF

86.7 KB Created: 2021-05-30 16:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 79d6c807d4d61ef831f365f22143e704 SHA-1: 915b576fcb5fc71e8de9131ca417917f0c6aa3e1 SHA-256: f5077ce61b7a53fd46243d7daf89a05f97c990f1632894f2d0951d711fd247e6
186 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 0.9995

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/123?utm_term=jargon+d%2527+informaticien+mots+crois%25C3%25A9s PDF link annotation
    • https://mawijazug.weebly.com/uploads/1/3/1/3/131380733/bikoxa.pdfIn PDF document text
    • https://rerofijujujedo.weebly.com/uploads/1/3/1/8/131872137/03106187faebe0.pdfIn PDF document text
    • https://bokorakalawu.weebly.com/uploads/1/3/4/6/134643693/8581530.pdfIn PDF document text
    • https://lizoxezubim.weebly.com/uploads/1/3/0/7/130776499/womipebejulitafupo.pdfIn PDF document text
    • https://gimokubibal.weebly.com/uploads/1/3/4/5/134528069/4892537.pdfIn PDF document text
    • https://rarogifiteli.weebly.com/uploads/1/3/4/5/134529860/9304001.pdfIn PDF document text
    • https://raziliselew.weebly.com/uploads/1/3/2/6/132695443/pivag_runaned.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/mexij.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/72c36.pdfIn PDF document text
    • https://jigotofobab.weebly.com/uploads/1/3/5/3/135300724/jotezivufig-bizazoruk-vuxisulapig.pdfIn PDF document text
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/xujov_selodewoset.pdfIn PDF document text
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/sikevujeserikim_nuzadaraguxopu.pdfIn PDF document text
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/8453628.pdfIn PDF document text
    • https://tuganokume.weebly.com/uploads/1/3/1/4/131452880/9f5593a7c91.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/3d88dcb1-7b8e-4c50-8027-be6f3ef5c0ac/88889384372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/134b5d97-cf2c-44d8-a2cb-40694f847d0e/97969363579.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f5a2683-e8d6-4001-930b-dd293ee6a278/pajizibozojuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b719b5-6b8d-4ff1-b265-5577289b8683/how_to_make_jpeg_file_smaller_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da067f93-d8ba-499d-bb23-e38fa77bc08e/gukuvogogevivakepetow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c28f227-f47b-43ab-b05b-518188924614/trek_incite_8i.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://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_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 5264 bytes
SHA-256: 41a82e1ecbc75da4501546f3d45cb413c3c5db48b645d9c326e3feb5ec6a5ff8
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 12868 bytes
SHA-256: f4b9a4cd1eddc066a00fcdb1d0a36cc71f967af22bf0a734e535b68518a48c5a
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16060 bytes
SHA-256: ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833
font_03_sfnt_off00013c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c