Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c0ae21e842c33e4…

MALICIOUS

PDF

80.5 KB Created: 2021-09-16 14:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6554e64fc768038ae3a8d057bd4eb696 SHA-1: dc37e3b1faecd4f9bc0d6c59516c251d6e5bd972 SHA-256: 8c0ae21e842c33e49784107a28b39deef00933eeb41556dcef4359c4e1122d55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external sites, which is a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies it as a link farm on disposable hosting, reinforcing its suspicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://aircond.md/upload_fck/file/8509757755.pdf In PDF document text
    • http://rnralpha.cz/res/file/wotafugadaviwubimulabupiv.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/56709176178.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/63310186399.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/zesitubareritegamet.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/sogukupazumutefuni.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/vaderi.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/73590894127.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/mebuvimusikoverufu.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/22635183344.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/faligenimoxuwesana.pdfIn PDF document text
    • http://offerparts.com/upload/files/73611436318.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16136f9f1630f3---84942578974.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/nafizaput.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/7997342754.pdfIn PDF document text
    • http://levotst.com/uploads/files/ropisilil.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/51917879466.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e2fcf7187aa54ad64ddc031114ead1a8/sanano.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/disabokakurej.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/76227932481.pdfIn PDF document text
    • https://termoformat.md/img/files/pidedabunebiwajeno.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/taroxefajuxog.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/46385525703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=essentials+of+nuclear+medicine+physics+and+instrumentationPDF 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_off0000d38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9D 18172 bytes
SHA-256: dfc1a84cd21075130741096aadff2de6028577b17960245bd3210f2c875ac901
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 11084 bytes
SHA-256: 08eec4272b06a9dafba661c607dfd5fe505d5ff1b3f41147eeec38cf1fd06af5

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