Malicious PDF — malware analysis report

Static analysis result for SHA-256 7384f61d218590f6…

MALICIOUS

PDF

101.1 KB Created: 2021-09-08 19:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 533948fd3ce174b8d8e52a64f12f36ff SHA-1: 3a8bb73ab3ddf602f05c2252f86c88d6e1ceb862 SHA-256: 7384f61d218590f6364eca9c43498d4d074f6e26d8c78c4152ef5645686da4a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially disposable domains, suggests an attempt to deliver a malicious payload or phish for information. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam, where the user is prompted to call a number. The embedded JavaScript is likely responsible for executing the malicious actions or redirecting the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://swalaya.in/userfiles/file/40380842524.pdf In PDF document text
    • http://www.mostex.sk/files/articles/file/50209123034.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/sofuzibutum.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/71957989838.pdfIn PDF document text
    • http://kaies.net/upfiles/2109072317146850013egb02.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef25302d2f---42277563838.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/24930767385.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/genimigemuxalujiw.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/68796144943.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/26280712870.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xiloj.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/wozarapowinirakupubet.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/kopadujup.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/57414789054.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/63891867387.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/67763836501.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/kusikobefor.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/58716916306.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/52945859704.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/95868757496.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/83667737092.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/bafuziterebeso.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/tabibegumet.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/42646585893.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210904175101323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rytec+predadoor+nxt+installation+manualPDF 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_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 20100 bytes
SHA-256: 0534c99ea7333e5048479306967c12da6b9e1d250f87bbe9b94dfde5a3e95563
font_02_sfnt_off00016ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE5 11036 bytes
SHA-256: 719cd8d88c0af37b95d61b89a42968a637442c474ea29125a8ddee6d6a35d6a0

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