Malicious PDF — malware analysis report

Static analysis result for SHA-256 5871506368766c30…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 17:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5f6bd5954b7fe7758cdae67d2839c2a SHA-1: eed17a795039fbc996c18dca12349b6e34c599d5 SHA-256: 5871506368766c30a8a048fdcdc5077823f09f0dd6cde87da9d596517f9e8e2e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, with heuristics indicating it's a link farm on disposable hosting. The presence of numerous external URLs, many pointing to other PDF files, strongly suggests a multi-stage phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 69 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 http://inlovehuahin.com/file_media/file_image/file/90685466591.pdf In PDF document text
    • https://kalashad.com/userfiles/file/zaxobabigevulagini.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/vapitufel.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/7686360548.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/96867160902.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/36913371971.pdfIn PDF document text
    • http://medica-brno.com/files/fisanopovozuxasemer.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/dui3fc43r01tdl37hl9u9d4nib/fetovetu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/fozajanasefajiwo.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zoreminokateb.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/77323846174.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68931492328.pdfIn PDF document text
    • http://bjjiffy.com/upload/lusaralinezinubinu.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/99053607718.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/70281984742.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/sowerenubi.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/zopamaxokubewidu.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/82201191272.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/rovewenasikopugo.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/nijeniwawepu.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/20764802198.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/mefonu.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/73202132587.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1d14be02---65197233094.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/lomoxinaxifovuzuziwegowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=windows+10+update+timePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB370 14176 bytes
SHA-256: 61e413d8c086ccd14582d5840034775dede2403dc16afd5a044e81eb55f2afde
font_01_sfnt_off0000d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 10760 bytes
SHA-256: bfe6d2b3a366f8c284c0b3b0b9e8f9b2b6cf0565081b1eff5d1f356a1d610f75