Malicious PDF — malware analysis report

Static analysis result for SHA-256 a310c7c7ed47d795…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 09:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c7d83427c5e65b9687fe321d99125103 SHA-1: 5eec43fe8d4b3c5125f14a2e6707a58218e8d72d SHA-256: a310c7c7ed47d795fb55b82c429c4fa61658779677ba9eb6d9ff1b7765d4dedd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=hd+football+live+tv PDF link annotation
    • http://cedule-plachty.cz/files/file/fokupowuzuk.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/88641790574.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/80631118340.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/62626701402.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210903130110.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ce569bf1470efe3d10ed860fede8d9a6/vusapiwaxotonaviridomiku.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/39193259099.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/samuzitariwozenekigeju.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/7186555310.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/60403421801.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/33998453614.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/nolanoluputela.pdfIn PDF document text
    • https://protrialse.eu/files/files/samimegogigux.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161402e2b0602c---28399583267.pdfIn PDF document text
    • https://bloc-immo.com/images/titozixizigavakotagigola.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/67031969800.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/10787384964.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/vogojozakalilinelivub.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/18735684872.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/kimokubisedevine.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/52133305108.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_off0000af88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF88 10172 bytes
SHA-256: 20354bf47799f1d801904e85adecfa8a4648dd39395e7ce5f3106bbdb6e0533f
font_01_sfnt_off0000c665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 16200 bytes
SHA-256: 63e32b78d4c746ddc0180edc8daf5f368092cb6145f8c8666e1443ca1bda7f56

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