Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef44fc5d71c9446f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-11 00:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da885c4d88e6c7ebcde664214730181c SHA-1: ab2d9b1d74a70d1bdcb72673adfc550c5aab0cdc SHA-256: ef44fc5d71c9446fcf2782459c85fdfcb89c916f3aa6c9211c05f66cbd43c4b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded content are consistent with attempts to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=free+comic+book+app+android PDF link annotation
    • http://gs-metals.com/filespath/files/20210907200516.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/80860210279.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/19089589079.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/kedujo.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630691243.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/zowirokapanuj.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/45550576495.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/nopotoxu.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/71771057496.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/takelewakedurimuzogili.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387819b4388---72738931341.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/kogibaxevirinufasofisupib.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/tosunogizola.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/41046480383.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/80685744712.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/46736070.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210901133029.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/nasojulisiwiselaminivuzi.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gazumabugokiselabisitanow.pdfIn PDF document text
    • http://apcmagon.com/userfiles/96604078620.pdfIn PDF document text
    • http://meta-min.com/files/liwini.pdfIn PDF document text
    • http://fxlcd.com/upload/file/vafewabaxakijefe.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/ganujexa.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/kodemukimovi.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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 10572 bytes
SHA-256: 192b4488a60d9f55287af3611b06ea84e7b31eb7a6400943ecd1050154ecc021
font_01_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 17600 bytes
SHA-256: 4d80d51fde98984f367115c5c24f89540ebf39ca3fcbf0e9e09551a9f3be2cad

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