Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df99491806cf46b…

MALICIOUS

PDF

78.6 KB Created: 2021-10-10 20:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac214c2722f4cd95af92af8c320c5014 SHA-1: e64ab213851b6563ab6a3de2070bc74e7b2440bc SHA-256: 0df99491806cf46bf6286f7f7d479f012858794981457753f989e2c33532e1c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious sites. The presence of multiple external URIs and embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=psp+free+games+download+iso+file PDF link annotation
    • https://jfava.gemwareserp.com/userfiles/file/xaraxakudiramefibogekav.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/1286023479.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/xuwopup.pdfIn PDF document text
    • http://unibox.lv/files/text/godekiwaxob.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1879102096615302bd79a81.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ed785c26b7.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160b6d72316b---pilawaroxotunobetado.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/39738512734.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092215061573499.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/tofujuvibibetofonepofup.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/bumanakoromig.pdfIn PDF document text
    • http://homeopathyhk.com/files/nowesoj.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/95211208978.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/rigavejopolelinetodexojif.pdfIn PDF document text
    • http://pskov.agisinfo.ru/uploads/content/files/55153982356.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/34198530573.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210909123724183.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/95873507055.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/13410080277.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/mixaf.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/52875679232.pdfIn PDF document text
    • http://e-district.org/userfiles/file/32269375167.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/75655462553.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/zevebi.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_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 17972 bytes
SHA-256: cfb93e472321553caa0386ec37f219bb6383e1ceef70b59fb14b0e3d7075fcea
font_01_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 10828 bytes
SHA-256: ad7ae923b9f20366616492053459a146ace23fa236a94dcbdba8f8a48417ce34
font_02_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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