Malicious PDF — malware analysis report

Static analysis result for SHA-256 623b0bd8f2b6c3d5…

MALICIOUS

PDF

87.7 KB Created: 2021-09-24 00:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: baf80dbff0fb23a1f424c3c1c07d0756 SHA-1: 2ab094b0b164b018a82961a34e543f55191ea412 SHA-256: 623b0bd8f2b6c3d58b644bdbfe4804de089fc4101b9feaff88ce36332857f567
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=rooted+android+phone+tricks PDF link annotation
    • http://copingconversations.com/userfiles/file/bogesebameteze.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/597976d7ede7409a859dee822f1bc529/53927366405.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/liwapax.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/kezeliduwazizabupev.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/32200656225.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/gomesun.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/guwujobidajukakaxawi.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/882796206147df1406adb.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/95865547088.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/76301949297.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/sajututumukivoxefutawo.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/15421011352.pdfIn PDF document text
    • http://asfalon.com/__files/file/3129046047.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/napanetopizi.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/50560550607.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/sabakelikebebadofasugu.pdfIn PDF document text
    • https://nyig.com/files/file/vumuwipupifopewabuner.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/mobovejumopupenijalaget.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/xulowufadodinogamud.pdfIn PDF document text
    • http://maksimetall.ru/files/kofexalarunekunabalid.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/dujomu.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109011852045173.pdfIn PDF document text
    • http://4bx.pl/public/file/90610970088.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/24560586902.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_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10704 bytes
SHA-256: 18545ad1a7d3c3ccefe29c94615c73169ac5b52f0a1f37fed078974e49f83a1d
font_01_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 18588 bytes
SHA-256: d9c6f25a24ec2ee73597f16f4a031bcb34859d5145096abb8feca79aeb3bc37e
font_02_sfnt_off00013965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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