Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e517b2419fba92b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 09:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b2a580952ad0dc0177aaa112e1f5497 SHA-1: fed9e7863e60809f2e8c688e638070a1361c051c SHA-256: 4e517b2419fba92bed9460baffdbbc46984ddd3c6d6c504c7236fc62a709955d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, identifying the PDF's structure as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=how+do+i+remove+a+bluetooth+device+from+my+android+phone PDF link annotation
    • https://onecre.com/images/content/files/73319527253.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109052146209184.pdfIn PDF document text
    • http://abworder.com/uploads/files/91053078007.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/japozutinorizame.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/luniruzojube.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/379891930.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/rekupipa.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/65281386162.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/81941275901.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/kepamim.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/60429440578.pdfIn PDF document text
    • https://aedwea.com/upload/foto/jesilisukutopizufubupor.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/redinajopodopo.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/53611655744.pdfIn PDF document text
    • https://sapporopools.com/contents/files/gikafa.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109081122331876.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/gigukapowabewonazi.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/volemirakujopide.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161332096b9932---69448782995.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/jowojekuw.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613764a84a71f---13361068172.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_off0000d426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD426 17600 bytes
SHA-256: 068600be198ac078bc7eee73f03438a8d441edd8abdcb0e64402f13905a996a3
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 11216 bytes
SHA-256: ad91bba1c57f4d30e3945acc3eab9ec73f3ec5fa133c12d5dbcb5857c16e204a

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