Malicious PDF — malware analysis report

Static analysis result for SHA-256 3979786c9318f970…

MALICIOUS

PDF

77.4 KB Created: 2021-09-09 12:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ebad70db0a08c8cc94360f4afb7247f8 SHA-1: eea155a4ced9653a7be03e56fcb1b0c9743eff3b SHA-256: 3979786c9318f97093752ea8e10adba4b00c7c8882e957774b9a42daa0848d3d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous links to disposable domains and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a link farm or phishing operation. No scripts were extracted, but the overall structure and URL patterns point towards a malicious document designed to redirect users to potentially harmful content.

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 http://lawyergz.net/uploadfile/files/79694006302.pdf In PDF document text
    • http://labuchedeberce.fr/userfiles/file/824060823.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4b03812803ce8dec0c5ec4d739ceea4/gomotoludozonu.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/48355978025.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135baa20cc25---521386093.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/boxemudabijos.pdfIn PDF document text
    • http://rapet.hu/files/jorozusezajenuwugivuso.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/40945596937.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/jidewusisogobikuxi.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/vawabewukubuzux.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/78041573511.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/vipatodopemuj.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/13995480595.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nitebofizezoleduzitevira.pdfIn PDF document text
    • http://sun-eko.eu/files/file/judulavedokimufukexumed.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/powedojivigali.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/jomigupojiguxovur.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/nuvenevukuvigigeteroxus.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/kabax.pdfIn PDF document text
    • http://tipiland.net/upload/file/sekapogutisogajibenalal.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/mapolirukosagotanuwetara.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/36638128733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=door+slammers+unlimited+money+and+gold+apkPDF 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_off0000cb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 16872 bytes
SHA-256: a134cf673044c02357ae011b8fc72a13a3c93f6073f994f5f52e48eca4d68102
font_02_sfnt_off00010e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E66 11040 bytes
SHA-256: 770d44ed4e692ed26a2735bf592c66cdca7e657627300c1c66023b2e48f667db

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