Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5607b4b35d7fb6…

MALICIOUS

PDF

88.5 KB Created: 2021-09-13 11:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 26d89271e17e650af7dc33f11ac0ff62 SHA-1: 53ebf9da8c4f89a167a3194335d2600709eeeb35 SHA-256: 7d5607b4b35d7fb61b623d8588329fcb15d5895ba118cc05b840835342aadd69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9976

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 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 http://obras.ru/sites/default/files/uploads/gidajalezuvepojomatu.pdf In PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/67759889119.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/33826402081.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/83173145787.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210912_BC7BA4291F5BD3D5.pdfIn PDF document text
    • http://pk.mo/userfiles/file/62709406446.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210906_180757.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/migaduj.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/batewodirid.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/25592143557.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/sadovudegilabif.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/vekalagapelorevaxevod.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/25587591855.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/3134728087.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/2381564792.pdfIn PDF document text
    • http://moretonassets.net/userfiles/75872359839.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ragil.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/31173785105.pdfIn PDF document text
    • https://red-adlay.com/upload/files/jorulowanumuxedijov.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/18506311754.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/tunekuwipuvibujupox.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/lomodisugibibewadaju.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/32873474538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=writing+about+writing+4th+edition+pdf+freePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 17472 bytes
SHA-256: 97412592b7c9aeab365a67f91d85f7608140a23be931d1f8e97fcc4eb45bbb04
font_01_sfnt_off0001230b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B22 10960 bytes
SHA-256: 861a341339890b6da3547641c56c172ead9b187e3fc80f108bab604c744e2dc6

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