Malicious PDF — malware analysis report

Static analysis result for SHA-256 400643460f768fba…

MALICIOUS

PDF

79.4 KB Created: 2021-09-12 14:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 114fedd5a2eabde2e7d506eb27cebf07 SHA-1: d337ef1530f4d424cadb4ec910ec864d417fd27b SHA-256: 400643460f768fbad287bfde5b0e2267675692b5efec981dde2331d5c8428147
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs, including one that appears to be a lure for installing an Android application, suggesting a phishing or malware distribution vector. The PDF structure and embedded links point towards a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=install+ir+blaster+for+android PDF link annotation
    • https://suprastoc.ro/userfiles/file/kokusifipunaxuzaguk.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/42629431943.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210908_045356.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/87887544870.pdfIn PDF document text
    • https://ms1oke.com/contents/files/11814491857.pdfIn PDF document text
    • http://forti.in/userfiles/file/99732636726.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/pivimuz.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/5872156729.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/jazakuwoje.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/gemasotuboboti.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/87172681362.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/22754267493.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ba7375e4e---18202410469.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9d1f16bd---zutotora.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/nabojaz.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/joxuverasugomaj.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/selogagiwusilotek.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/91646098395.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/39035524630.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210904033631871.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/38108159258.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/guzut.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/73182935366.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///25297955909.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/jemogediki.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/89980813497.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_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 17016 bytes
SHA-256: c7feb9d4ab7d43cb82d8fdcd4ffd9025c4181bdb7d1c61507d9eabcbe1e2a476
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 10436 bytes
SHA-256: 2136e14af8673433d1ddb68a322391a0c60946a7231edb4f617195107ee9cffa
font_02_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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