Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ed4d819d67e595…

MALICIOUS

PDF

76.1 KB Created: 2021-10-05 14:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 52ec8e39ba5c9ad7c1a27d20ea889fcb SHA-1: 43c26179e8d8919c8b5a7b56bcadd94b1972e142 SHA-256: 66ed4d819d67e5956f2645a433ed571d21e7005cc200794dbbb006ed59949530
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=microcontroller+and+applications+notes+pdf PDF link annotation
    • http://aimic.com/userfiles/file/foxuxotesugutemufanutopak.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/xibiret.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/52742901801.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/83d9aeb14e6ced3e398864f3aa074801/zafulowemadu.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/levikos.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/lenopomadu.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/85880753905.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/ruxixakevamesitusagoxun.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143083f1b956---62203389458.pdfIn PDF document text
    • https://ms02bet.com/contents/files/jesubotixenoxatifewu.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/63134176755.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/duluguvizixozidukadorobiw.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/rabesib.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/waparamarezuj.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/mekuzipemige.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/68697154876.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/nawamukixolafa.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109052033073407.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/80065204264.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210905/1226188655.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/kulinuva.pdfIn PDF document text
    • https://filetorme.com/upload/files/90274875945.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_off0000c1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FE 18228 bytes
SHA-256: 88f6bcb4ae5ef27dd3f3113ba7a513f3218966e3354121f1206334c56c9e7b3c
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 10608 bytes
SHA-256: 3d7f7c21fde14f238b165d1a04b486827f8e7935d6f1c66873f536e6f7355485
font_02_sfnt_off00010a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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