Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc5e8ff1f8a68f63…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 07:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22484ab90b876e26d3230a6c520d6fd0 SHA-1: afba61e73ea1d85c87cc2349eedbd1946f21ea69 SHA-256: fc5e8ff1f8a68f63a38bc591b9ff63eb3908fa63d4c2a4eb621f840dd37e26ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains a large number of embedded URLs, many of which are on disposable or suspicious domains, suggesting a link farm or phishing lure. The `wkhtmltopdf` authoring application and the presence of embedded links indicate an attempt to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://huntic.ru/uplcv?utm_term=gta+v+apk+original PDF link annotation
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/90626244395.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/10468910411.pdfIn PDF document text
    • http://tral-kerch.ru/userfiles/file/72159143753.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/mivedetejugazibojukorono.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/5106318150.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/87890189814.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/54731166532.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/miwaxelisodexawopenox.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/mevexuvab.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/rokukekajinizad.pdfIn PDF document text
    • http://rideco.hu/upload/file/noxajopez.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/rokikogogasa.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/lukesumirabarak.pdfIn PDF document text
    • https://avflash.nl/upload/files/62825383085.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/86769111959.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/338b686b6a7a8a0900ee8f8a91b576e2/74672233971.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/32563093936.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tuguje.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/mezatetu.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/biparimofekutefopizu.pdfIn PDF document text
    • http://financesnadno.cz/upload/file/69812616208.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/47083219081.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/ladus.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_off0000af5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 10324 bytes
SHA-256: c3f364cef8f56a5b00a1abed91e8cf0bb98c934a2089a18ad83f5d8064da2ba6
font_02_sfnt_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 16700 bytes
SHA-256: 4d999816e1a9fb57b61fc7b3052c45caf467c64ffbeed3ddb753d7dbd6dbe7b4

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