Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5814119c1ea8d6c…

MALICIOUS

PDF

74.0 KB Created: 2021-09-17 17:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c6f393e7ca9adc63c210b41454f3f081 SHA-1: 43347cd1f1c8286a1b0ae3e43eddafa062bf79c4 SHA-256: c5814119c1ea8d6c2894d8c7e607203bcd117125ca1459da12ea5c323520d410
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure suggests an attempt to exploit users through deceptive links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://philabc.ru/uplcv?utm_term=can+could+may+might+exercises+pdf PDF link annotation
    • https://movimientofamiliadejesus.com/images/uploaded/file/42672348233.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/33300704943.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/xifedewigujideliro.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/40928470913.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/saxadif.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/16998297141.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/34878783160.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/57527789999.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/raziladopunogapuzidojoz.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/96307838487.pdfIn PDF document text
    • http://citra.cl/userfiles/file/farezudanolinonubupi.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/foriruge.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/kozifutetejaraketi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140931bcf678---74351280331.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/rilubokoxogojuki.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/naluwevasitasovomi.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/42309076824.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/lewegarik.pdfIn PDF document text
    • http://goref.ru/files/file/nobinokeribotukoribex.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210913_A631F7FC790407DE.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/45748440258.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/39121494859.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/xuropize.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/wexuxurifusolijevali.pdfIn PDF document text
    • https://led7.ru/file/xobonu.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/retozuwukes.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/22386761661.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_off0000bd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7D 11416 bytes
SHA-256: 29a941e5a6a50919f6213e3db49713d4f661cf5ed95acb0ab5449a12adbde85f
font_01_sfnt_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 16348 bytes
SHA-256: 31d216308d7686c8d3174583ddb47ef66169cdc877c3f6070034d0657181518d
font_02_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1