Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b203e9154bf0e19…

MALICIOUS

PDF

80.3 KB Created: 2021-10-07 05:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e67e33d0293de5ef841714c0015fca75 SHA-1: 25eebee9505afb2877caca868f14737d181e169f SHA-256: 1b203e9154bf0e1951a41adacf34e59324fc2129b6be71e0b75ea67359846bde
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 numerous embedded URLs that act as a link farm, directing users to download other files, likely malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting numerous small PDFs on disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://laborke.ru/uplcv?utm_term=netbeans+ide+8.2+free+download+for+windows+10+64+bit PDF link annotation
    • http://pincailight.com/zk/UploadFile/file/2021090413164473499.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/88881528982.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/gimiruzuva.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/47120864726.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/49086087050.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/lijidomojole.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e20fa01735---30363507191.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/kinibipakesiditobag.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/texopa.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/31959537573.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/lovibet.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/pavarejubuvizut.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/32778284255.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/ranotir.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161590c45c4b55---40809882131.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210916100929.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/zigomufenojabovawote.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/95404777678.pdfIn PDF document text
    • http://traviet36.com/upload/files/xuwexovudew.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/27537588489.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/7657643059.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/kefoposizekibipo.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/47586372765.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_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 17420 bytes
SHA-256: 0d7f6900a71b3b187004d115c4e2ef2cf19383a56533954a7b1e4d8c57e363eb
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 11364 bytes
SHA-256: 92ce43f0715aad9af43f98db29a416f42c7ba4388f9d103ef70da91213b209e7
font_02_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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