Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ff6cacc7cdb6fc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 22:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ceaf4d3340b6c4ff05a32ab340902a24 SHA-1: bdce1ad01099f03219fbf37c15db8afe8f4b0ee3 SHA-256: a3ff6cacc7cdb6fcb896857c1c8b089b1090543e4ba3aa964513b8a09e6e6d1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous external URIs and is structured as a link farm, with many links pointing to disposable hosting. This indicates an attempt to direct users to potentially malicious websites, likely for phishing or malware distribution.

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://coretry.ru/uplcv?utm_term=music+player+android+without+ads PDF link annotation
    • http://ahjygjg.com/upload_fck/file/2021-9-9/20210909095442450930.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/94661960498.pdfIn PDF document text
    • http://rurisnet.org/images/file/wagadufitarogizebom.pdfIn PDF document text
    • https://bem-sa.com/img/file/84406388911.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/97054636104.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/bajadikunidaxixesawagop.pdfIn PDF document text
    • https://bunianco.com/other_files/File/vebopisuvamaxo.pdfIn PDF document text
    • http://beiks.info/public/file/82771598544.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/27847914421.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///wolugabuluzetori.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/89927573791.pdfIn PDF document text
    • https://asiapharma.la/files/files/fajozonenivenavejatikunu.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/sefegorajonitipofoka.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16143a314828a2---pozemanozabufeka.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/mefosunafimufufotofulam.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109110346569439.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/wawizetite.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/bozisapoxorefe.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/weberuroxebivelibavol.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/1794541014.pdfIn PDF document text
    • https://anakmeong.com/contents/files/9539161544.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6e6da2693470f756657cdf973a42cb1e/sirapajosewovidipesanus.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/dubazusitenobaxubuzixax.pdfIn PDF document text
    • https://felicityokolo.com/file/sedosipadig.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_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 16596 bytes
SHA-256: dcd6509b6538d3d2ffbae8e18ed71267c789511f1c44080085195ce523cb7b7a
font_02_sfnt_off00012184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12184 10904 bytes
SHA-256: f2c127c6644ccb8058e634dbfa2cf0d8ea24a41b547c303e475831889ebac778

Open this report in the interactive analyzer, or submit your own file for analysis.