Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2c77fcf6d819c3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 03:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b037ba87d351a462e829e1915cf6120b SHA-1: 75ec1808eb5dfe558982fec54ac3e82e144ddda7 SHA-256: 4e2c77fcf6d819c3ec6597a3bb584fd4e0c3f074d50c6477b47849e481f71563
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=tubidy+mp4+download+2020 PDF link annotation
    • https://hatinhjobs.com/upload/files/doferulosipefaviw.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/23307131728.pdfIn PDF document text
    • https://telorgabus.com/contents/files/xafevidumejodenesuro.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210912_2E4F49BA563F5599.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/2998039653.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/85387572317.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/walemivipojenozomewobapez.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/73813958028.pdfIn PDF document text
    • http://vinmexindia.com/uploads/redotokerep.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/97771588977.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/81848252093.pdfIn PDF document text
    • http://synfarm.com/upload/files/75611045432.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/91184061186.pdfIn PDF document text
    • https://kultmotor.hu/images/files/18614273186.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/kiwirudibebaviwenaku.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/52810862004.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/dekoxenojagemijinuxevuwo.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/38992490712.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16142c9f72c00e---34060548414.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/muvetu.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/muxibidisobiguje.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/963220724.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/seledusiforakasoziroxor.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/gekekikuvitezalufuse.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_off0000daaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAA 10780 bytes
SHA-256: 5618c39aafe73a2f2ed17d83020f87ca002b6c2829ece58b1afd0b5147058b41
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17776 bytes
SHA-256: 1fa184cea058dc1392d41ff951a781c122b7c539771cb266e3c406802caed198
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.