Malicious PDF — malware analysis report

Static analysis result for SHA-256 a413e3aeaf3b1f45…

MALICIOUS

PDF

85.0 KB Created: 2021-09-08 22:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b141e2ff2ba0de7b72dfe340a80972d6 SHA-1: 22e8eef61da84f194e15718be096d1fbef581a15 SHA-256: a413e3aeaf3b1f45058a9209611b1c8fee5e5e0fdf24c820bdeedea7c128d5ee
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript suggests an attempt to exploit vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=pvz+heroes+infinite+gems+apk PDF link annotation
    • http://newbusan.net/FileData/ckfinder/files/20210905_51F9CA2438ECB228.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/14518540153.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/bilarogivu.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/pimawigogowu.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/wetofinegizufukubofuzuwa.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/vikininejukasajufox.pdfIn PDF document text
    • http://apcmagon.com/userfiles/dinilu.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/dofokidojetixik.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/wodazumupo.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/bopopatorujevezoxus.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/83134975887.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/53779339124.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/92951609111.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/54304920318.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/55199133782.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/rupujazusevupajivazisike.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/vusejadimuw.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/divabivoborawub.pdfIn PDF document text
    • http://nova-auto.com/upload/89828596760.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/soparevigapazamur.pdfIn PDF document text
    • https://j26clean.com/upload/files/94367280502.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/88068259642.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/najepukepun.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/22264279758.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/73764416241.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_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 17648 bytes
SHA-256: 43aa26a0dc2d2d8bdcdfd059c25abdbf3b58921c7a2821d5861e2da6c1c04f95
font_02_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 10976 bytes
SHA-256: dae2d6106d6812d302b82dedf611ac1212e3f64189a038fb73badd827fe29e01

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