Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c59ca3f2279eaf…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 22:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2654b90acc25ed3d13bee1aadb8b3d7 SHA-1: 6b58d511b501069df955c3c4c5d62a24cfe6aac2 SHA-256: 79c59ca3f2279eaf45fb61c6f7ad444cb62c405dff6d0888b73b8dec5c6baecf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies the sample as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://oumkua.com/userfiles/file/16831393505.pdf In PDF document text
    • http://dungcucaytrong.com/images/files/kuroregapojosetu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/mazoxuk.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/87520430250.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/zenixapelelose.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132563230ffb---65803574128.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/32431050303.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/50431821342.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/255c4b0c0ac1617b482b8de175f814ab/35045952421.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109061303186680.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/tumixajemoruk.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/70442398960.pdfIn PDF document text
    • https://proxus.nl/file/24801283177.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/5586178907.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/jasotobufudirademapanem.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/baluduzowudesoxuzavere.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/kofosewojolopujarexim.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210914_AB8BC7F8F8C3B1BA.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/pidag.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/2021941610389516.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/59246980389.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/zexatuteteliruve.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/saterufazawewikaroluron.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/zidisubavaxowijupovakev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=quantitative+analysis+chemistry+book+pdfPDF 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_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF82 17684 bytes
SHA-256: ffeb4a68eb6f7dbfe15be698826aa480a8053b95ab63d202f04e2f2ed06ad6e9
font_02_sfnt_off00011c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9E 11456 bytes
SHA-256: bf43e2c4a25eaa07261e761692f49295379e84b732a3b3137eebe3e91c84df1d

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