Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2312ade56a9b69…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 11:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ed7b0399f4945684261d69d840bdea7 SHA-1: 1f445afa149016c4121cafbab49ef30cad4f5cab SHA-256: 2c2312ade56a9b69dd21da8ae070a90e786d39266cfb054803ecd62589976e09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting an effort to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=payphone+violin+sheet+music PDF link annotation
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/63338155854.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/dexama.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/gusetuzexip.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/jenilibolupovuselazib.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/88043454338.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/38622028969.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l448pf8n61fkrqp10i8l19tq95/zumuzazulinujali.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/3703567835.pdfIn PDF document text
    • http://rjt1.org/upload/files/44097874523.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210914113210.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/poperiwudotebapuweravede.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/15196067721.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/1772282301613e26606ed62.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/45752496271.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/wemerulafujubanig.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pekamaporesavufovadeda.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/29407193477.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/41025057246.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/nukanoxemamitozexo.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/bovapezolumev.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/98204222113.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/69529488927.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/zokitisodezeti.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/xiwus.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_off0000d5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 10820 bytes
SHA-256: 7f8a7e1e7d5905ddfd32b6739034cb903a7384e2f92e48353540ab70dc154fb5
font_02_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 18856 bytes
SHA-256: d0e3d4cefcf19c20d504064b467c39fa2c00e28586b44960b70abed136f86d91

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