Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab58639c0e0c90ad…

MALICIOUS

PDF

67.9 KB Created: 2021-10-03 21:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e75bdc09f69e928ea94acb0058bf6e87 SHA-1: 1aa4dc95571e02b05580e10e370549a30d7e1f61 SHA-256: ab58639c0e0c90ad11fcb6b45d0b029540d694a189be7d17a4bab219c972deed
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with a clickable action, typical for directing users to external URLs. Multiple suspicious URLs were extracted, suggesting a link farm or redirection mechanism to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 0 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://drafthe.ru/uplcv?utm_term=girls+out+late PDF link annotation
    • http://palami.by/images/file/jomojadivixax.pdfIn PDF document text
    • http://apicn.net/upload/files/395239186.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/84906828918.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149476177e41---runurupimexujiserux.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/61358273067.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/nuxepivi.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/juwogepofoxixofelojorunud.pdfIn PDF document text
    • http://ipceurope.com/assets/file/kavaxizutiwedil.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/vopumafekit.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/25069084255.pdfIn PDF document text
    • https://arkadas.yuzuktr.com/eskortarama.com/resimler/file/janegefigakunujimareb.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/jaxir.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/zodoxoxixi.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/70097376821.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/43879886747.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/futajenugevasuperefe.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fae4d742c0be62d877a79b9874f8afaa/16003501236.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/5f5c811a400869aeb7f090f7ccd416a1.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/vegaraxurobupokitedoraso.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/vudamoxozasagerat.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/93525569938.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/momejotopobonone.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/molisuwifepidutuziri.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_off0000add3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E5 14456 bytes
SHA-256: 1d964143e67c266d70883b1529b07fea8e21574cab7f886df073fcb33e054c3c
font_02_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 10136 bytes
SHA-256: 0530ee2496c88796031a8245121b21183466aaa767a6c6e8208561c124bdc56c