Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93fe72c95f92cdf…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 13:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24671d0914f1723f505e55f92b67abe9 SHA-1: 64157824d70ea8684dc292f0b852d345b59d7b31 SHA-256: c93fe72c95f92cdf63358976f7e6567a8f8beb01f792ba1778927a35f9fef16e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to harmful 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://wastran.ru/uplcv?utm_term=uninstall+system+apk PDF link annotation
    • http://uelzecht.lu/userfiles/files/22088350296.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/parenuno.pdfIn PDF document text
    • https://riwg.in/userfiles/file/66612926459.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/28103808610.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210913235051.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/golesamujukedas.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/xupak.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/zonofivarizuzigujorifaja.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/xigokesesureta.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/71101627586.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/bujegodipepugopu.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109011827123276.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/tizorofo.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/jurima.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/96324668290.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/zaxadarenimoribok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe427cd1d5---60323995001.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/83467607772.pdfIn PDF document text
    • https://limsurdua.com/contents/files/wozujekakipexizivudovul.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/mafelajolitoti.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/41691225465.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/17611286383.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/52154120721.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/volafuvanilakiroginige.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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 18880 bytes
SHA-256: 9873c57e6a53f4c57ec7454463f1c399524c919c6e560b6f364c9a704e89d0cc
font_01_sfnt_off00010676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 10408 bytes
SHA-256: 940ca9244ef139dd6630def06b1430633b091f6aa6747d40d3f2d289737f4ae2