Malicious PDF — malware analysis report

Static analysis result for SHA-256 274c403d62a330e4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 07:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f2f59476745a801e22933258027b9b9 SHA-1: b60c7bac443ab3fde1f7437d12f79c7099b36c76 SHA-256: 274c403d62a330e4eb1535382bcb0f42e10173c02401197978a499eb01ef9868
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, pointing to numerous URLs. The presence of embedded URLs further supports the attack pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://inwebjor.ru/uplcv?utm_term=spore+mobile+apk PDF link annotation
    • https://lawweb.info/mycms/admin/userfiles/file/66952699628.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091221521173499.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kikadepoboleton.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/91627420016.pdfIn PDF document text
    • https://ptogel1.com/contents/files/91022884999.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210911035215208.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8530272d3---tibakabikimisukabegawizar.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/nezopuleb.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/26741364563.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/89881424300.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/3769653567.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ltfdt7num8pnju6nom7mf6dsb0/10716885215.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/29484327505.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/zikivevibovu.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/bajawi.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/wulufiwa.pdfIn PDF document text
    • https://www.food-equipment-store.com/fckeditor/uploads/file/ravabifido.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/govepegosufurodibavoj.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/vinurizalogakisuweduvokar.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/zuwiwajijajemetara.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/tiwoteti.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_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 10348 bytes
SHA-256: 1f5f7f7b9f0282fc8dc25c119211e2954bde48b286d03fb409a0b2ca5e5ddb88
font_01_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 18268 bytes
SHA-256: 90df515586a350be73a627395b0f5d48664132e92b77648b84c4d429cb567085

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