Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f43c74c0d7ed9cb…

MALICIOUS

PDF

67.2 KB Created: 2021-10-03 21:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 304d77c8d9ee60623806db9e480f8a63 SHA-1: 965c681a11833b849618583ec07210bed3474328 SHA-256: 1f43c74c0d7ed9cbb18a1dd9fa94b0e1d107f75ae52ffde38901effa9d8d301b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot-based attack. The presence of numerous external URIs, many hosted on potentially disposable domains, further supports this. While no scripts were extracted, the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/bopinovolemoborinulolo.pdf In PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/12929392661.pdfIn PDF document text
    • https://synersys.fr/contenu/file/lojisefolibenegetenog.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/95181509281.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/80249514750.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/55927692340.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/naguwamudajovego.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/89564562218.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/90361417834.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/nivonilodakaraxojezume.pdfIn PDF document text
    • https://primer-spb.ru/files/files/1037890918.pdfIn PDF document text
    • http://full814.com/upload/files/wimipiwomagefeliwim.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9be4ea6b9---25394231473.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210911023133.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/44627528840.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/jajun.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/3060636023.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/22077839352.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/rawipitekifopove.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/80288512311.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/rurazavivuxenine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=examples+of+databasePDF 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_off0000aacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAACD 14176 bytes
SHA-256: 40f3c06a83805b5ce0fa3663d97e3d6434c030637cdd476ba867b6290349d933
font_01_sfnt_off0000ce63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE63 10588 bytes
SHA-256: 9291625759d1910e5fe278ecf7e92a45cb45704a01e7176039427ee2e6682dea
font_02_sfnt_off0000e669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1