Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2158c7d9e9d68cd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 11:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fa3f9de3bc7141ba20b2c3730b41314 SHA-1: d6ca36ed393aa3f392050721d8e1a0bb8a1aa3a8 SHA-256: f2158c7d9e9d68cdacab93f56477fefcacbe14c69bd9094a52fc4d1a8669951f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the nature of PDF exploitation often involves embedded JavaScript for malicious actions, hence T1059.007 is included. The presence of external links and the overall structure align with a phishing or malware distribution campaign, making 'Spearphishing Attachment' a relevant initial access technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=how+to+remove+password+from+locked+android+phone PDF link annotation
    • https://ctsgroups.asia/images/file/82824131432.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/30787233464.pdfIn PDF document text
    • https://linardi.ru/files/file/81335529467.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/39161143282.pdfIn PDF document text
    • http://polipack.ru/content/file/najusipof.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/kofiziwepunubukopup.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210912111910-12928875287.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/55286395232.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/75344880705.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/71595475031.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210913062740_1592786778.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7b9d0a188e5cc3167dc87a5f1300b45f/81271203307.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/23716725782.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/32546073747.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-11/20210911201519686953.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/misusefez.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/mamedefek.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/pasowuve.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/11843013077.pdfIn PDF document text
    • https://karate2.cdmedia.pl/userfiles/file/gadebi.pdfIn PDF document text
    • http://kezmosas.hu/files/file/nojonimeveg.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9120u16ammbq6jr6ee7vbglv34/zuxufawovurenopotikawedus.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/88975438379.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_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 11120 bytes
SHA-256: f78d27f8dba67e8fd523e4b5de700b7cc861f7887be476b42fb24a9d7872a973
font_01_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A79 17656 bytes
SHA-256: e4421a3696f12f435bb60a96e407f0e2963ae0631da29fa2a25c4d4ddcb8fbbe

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