Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce7079873c4d9b6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 17:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8e06e8f24722a4e5ee2117973aff9804 SHA-1: 4742d43ddaa94ed898b5e476d2c9ff8468cb39df SHA-256: bce7079873c4d9b646752c33bd0fa190aa1c3dbcf58e80f7e37d708ac1f437d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs pointing to disposable domains and is identified as a link farm. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://krisoc.ru/uplcv?utm_term=sleep+as+android+premium PDF link annotation
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/10163012266.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/43866490521.pdfIn PDF document text
    • http://theponghop.com/upload/files/93173059838.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/41445527455.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1b1450c5---63024989713.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/selakiwo.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/supezumaxewatawijajumomim.pdfIn PDF document text
    • http://sinostandards.net/upload/files/sasuwovenidogikamuxesaka.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/81400238520.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/61982678635.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/67271092775.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5g0j8o8hbqclr8sa50q08pm5oi/najigos.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/65711740135.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/92455320523.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/4801027291.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/rikuvuxasogotomu.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/78998485852.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wizuxe.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/kebuzutosilola.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/32129851895.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/99716432134.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/nixitanebivok.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_off0000d515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD515 10628 bytes
SHA-256: b01faa77830f93cb011f9b391bbe1413a1f21087462ab8361094733c3b3b1ade
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 18912 bytes
SHA-256: efe83b7b1edda2e7da64bd732c8a79ad0dd18dcf08596f3c11e0dcbd9df1202a
font_02_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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