Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad814c77594ee575…

MALICIOUS

PDF

71.3 KB Created: 2021-09-26 07:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7e652c06334b573c9adbf73475fe682 SHA-1: ddf213dd3792592755a88464c2fa0a788edcc763 SHA-256: ad814c77594ee575d4a17fcd3f357edfd04fe7ab4b687a247316e7062be49ddc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for link farms, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://infrive.ru/uplcv?utm_term=game+mobil+open+world+android PDF link annotation
    • https://csmgh.net/pevron/www/img/file/13030911037.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/nirodikozibavide.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/sosod.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/jakamalopovo.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/65263632551.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ramoxebixabevezowanugekab.pdfIn PDF document text
    • https://andana.us/files/files/paxej.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/bekodewepelawawon.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/wazebivanunebel.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/58733988855.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131d7fdeb253---42927811054.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092611554478.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/8156696216.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/muremut.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/fedowidovukulutamuluno.pdfIn PDF document text
    • https://kildevangen.dk/files/8427395045.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/34036123256.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/21924781559.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/28121606987.pdfIn PDF document text
    • http://93564497.com/userfiles/panir.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/52393989256.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_off0000b330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB330 17472 bytes
SHA-256: b00841cd20ad646b36e9d0a874bffa6bd73a3a03773b474e2637618603d216ad
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 10552 bytes
SHA-256: 9f239c4cb681552b9472f558b5b54faaac32c0b675e8c8d1ea8f3d6dacd8f1f1

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