Malicious PDF — malware analysis report

Static analysis result for SHA-256 12554aae63b1a3af…

MALICIOUS

PDF

69.6 KB Created: 2021-09-22 12:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad25c8f50f2e9963de3dcee22694ddca SHA-1: f1f159110f98216494b22bc12a316dad53ed065d SHA-256: 12554aae63b1a3af89dfa56e346e506549419c83425a14d9e5c9e4966995b674
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 a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/73398804767.pdf In PDF document text
    • http://exima.kr/userData/board/file/vexemodivasowuvotubudu.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/sijakanutosixelaw.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/40869140250.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/xujemogezili.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/zufajafexoga.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/4380235329.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/mowadibogilutabibofiresam.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/12629767737.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/38637049526.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/94970474088.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/bosizuzerotezipe.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/woxevawuwolesaronusem.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/rowakivuwenataz.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/3293531261.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/nejamoxavulaxinozem.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/50224587507.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/16167752286.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/bukevifakebeje.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136eaa2952fb---72474751819.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/h8pipba61nkcqs9s867d3kgfco/sorakugugifive.pdfIn PDF document text
    • http://rfychina.com/upfiles/files/16314942966738.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/rujozidemizeranelubedira.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-13/20210913225850194008.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/polexul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=where+do+downloaded+pictures+go+on+androidPDF link annotation
    • 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_off0000b397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB397 14144 bytes
SHA-256: 4c93fbc17df04061602cf961583646e18ff53d6266788d3a61e281a2928516cd
font_01_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 10972 bytes
SHA-256: a8741f7345181ffca1a0e009f3ecf8fa2d4d7a3133b2561b594c8bedd731ae7f
font_02_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1