Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba59d4baaf505f26…

MALICIOUS

PDF

67.1 KB Created: 2021-09-12 03:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: d55076e0177cbb1750ef922fd21ed4b3 SHA-1: 4cd2eb5de3201e3fdacf6a33aaf151f731130bd0 SHA-256: ba59d4baaf505f26038cb44770e420fbf366973c6ce3fc1c405b5601af840ded
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://philabc.ru/uplcv?utm_term=tap+tap+download+for+android PDF link annotation
    • https://majubesar.net/contents/files/fudilizuzogefe.pdfIn PDF document text
    • https://uangraja.com/contents/files/45880328586.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/6713688260.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/80490143289.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/65362902969.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/tubidisovopopuzume.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210911_095856.pdfIn PDF document text
    • http://kotrackusa.com/fckedit_file/file///20210907_3_52_14.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/90457779743.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631167127_68907dd34b.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/bekenis.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/18079678816.pdfIn PDF document text
    • https://onlinendttraining.com/files/viledafogek.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/refan.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/6774269459.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/titotubimibemova.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/73ef1dfe325b5602338ea88e906c0bb2/19917383163.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/gadowewatijatewofiri.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/48850644686.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/zajubiwizolixiwogujafez.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/66890705884.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/pojiwav.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/87061340497.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD25 10240 bytes
SHA-256: 6361d963f9864a7b581e8f6a6dfb4d4951a524bbea31388ffdf32256181bdcd6
font_01_sfnt_off0000c43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43B 14136 bytes
SHA-256: e4e30d0778e0938f7c453b14870c0a0da2b9ad26510e0dc29026d3b4e2188b23
font_02_sfnt_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1