Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5926a9fd9fbb12…

MALICIOUS

PDF

100.3 KB Created: 2021-09-08 20:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a79e564bd7ab451c10c1b4e21e0ee3c2 SHA-1: aca696984e75e550b2c775772763f88719cc98be SHA-256: 4a5926a9fd9fbb125e37400a8e6ce5d1e6780c53e2bd7d397d9c2ba664b62b6c
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://nabil-doukali.com/userfiles/file/92064944359.pdf In PDF document text
    • http://hanauhrova.cz/files/63013958312.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360dc423665---sutewefujuge.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/26017270555.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/zigivetig.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/kujukopumitobufexan.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/20041953676.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/fatunej.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/patofozokenet.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61354ECCD19D9.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/62884269495.pdfIn PDF document text
    • http://sungder.com/upload/20432745744.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/44433175534.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/58579900493.pdfIn PDF document text
    • http://forti.in/userfiles/file/92365544051.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/73855511562.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/vuwoju.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/gekibiwatu.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/19072904325.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/lasutoxe.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///27149716027.pdfIn PDF document text
    • http://gptools.net/userfiles/file/80269288781.pdfIn PDF document text
    • http://sakra.sk/storage/file/38994779232.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/wesomolejilukafoporonip.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/zodoxugikukenabojalinaku.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///woneti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=oxford+latin+dictionary+abbreviations+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_off0001216a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 11060 bytes
SHA-256: 604cf1d029b306084fd204a0f02cf45a23afac5253451dba21b7226e7ae221c0
font_02_sfnt_off00015334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15334 18392 bytes
SHA-256: 0205b4cb5cac7b672081f18da0b2484e4ab272d57670cb152b916f21ee079a54

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