Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d892567f3224a4…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 19:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 05a76ec42ee1d7002230df835a8c7066 SHA-1: 025a9a1e5152009a4b483a66ada73522c6fce9d6 SHA-256: c6d892567f3224a488acdd97393ff6e60fb5d5700744f369eb04138d17ba016d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm on disposable hosting. The PDF contains numerous external URIs pointing to various domains, suggesting an attempt to redirect the user to malicious websites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or trick users into visiting these sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://pixomot.ru/uplcv?utm_term=back+to+the+future+3+full+movie+online+free PDF link annotation
    • https://812423.situshoki1.com/contents/files/nixinifeweruruw.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/32044028724.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/75228317487.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/81403177269.pdfIn PDF document text
    • http://markone-tools.com/upload/files/72780575019.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/2083039479.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/296a025f852cfffb52f1a802a413bdb1/tofimopupediko.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/ragodurom.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/10952584810.pdfIn PDF document text
    • https://birotex.rs/images/files/jasulirosuku.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141053abc252---fexenipexonugimuz.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/81909084985.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202192428484100.pdfIn PDF document text
    • http://geoman.cz/data/file/41382562712.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16131636a10a12---pifibusipuwo.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210921_D2F6A4213262D695.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/kunomemuduwol.pdfIn PDF document text
    • http://chromoink.com/updates/file/31163506523.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/84582129919.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/xedakipito.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/58117396775.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/20646426594.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/butaberomisiv.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_off0000b0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BA 10916 bytes
SHA-256: 6778531756263e48956ee435b363bb4ab0d5ce35ee577f0af5ccba68eb9aa6e7
font_01_sfnt_off0000c9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F1 17316 bytes
SHA-256: 4cf1b58d6ea47d34510b8117a7c0eee923947a19d696666719d57f49298f7a70
font_02_sfnt_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1