Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c8cc226fb6ded6…

MALICIOUS

PDF

107.7 KB Created: 2021-09-21 13:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e181a6b3c2a8af955871b942af091a40 SHA-1: 689d549ac8d9b0aa0cc3bb1b444f781a9da6b4c1 SHA-256: 79c8cc226fb6ded66d2df4132457e3609afff3a8162343b5e0987ec8a3b95bf2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to link farms designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely to redirect users to phishing or malware download sites. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://kadh.kr/bobod/upload/file/mimawirop.pdf In PDF document text
    • http://globomax.eu/userfiles/file/jezezojidapuked.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/gisewaru.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/48317846188.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/patizuzidoxofanowet.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/30719130803.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/javoxafopopava.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/88441311648.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210919_4683E083573E037B.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/nefovanakoburebam.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/94789073980.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/1410602438.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/puxojufivovaxoji.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109010756541174.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/dalegowazosorejugisoxava.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab909ede0---56907552557.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/41540000364.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/pokonisikelutukerumesa.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/fefifizon.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/54933644401.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/78216210842.pdfIn PDF document text
    • https://aildf.in/userfiles/file/10132241889.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/maxotosusurasakidefa.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1359fb8988b1ad456c072eeca5f115a6/54833375945.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/62419181393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=clash+of+clans+mod+apkPDF 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_off000139dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000151ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EF 20820 bytes
SHA-256: a6e5c4c24fe061d44366e10b1f380c4f6b657dcaeb000a5723747609612ecf2a
font_02_sfnt_off00018914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18914 10584 bytes
SHA-256: 3d7b1e55c9a57790e6f55242e09a5f544e362e24a841d8af4466bc7c2a2b2897

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