Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0baa3ac3d417721…

MALICIOUS

PDF

78.4 KB Created: 2021-03-21 21:34:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7ea646481be9d112f7e86438c01ff9c2 SHA-1: 267d31ab70d134d7681ef43a5f2cfa30651e216c SHA-256: f0baa3ac3d41772154dd62e96954a10c323d0402887f6cbb11c34b036f43a43b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a title related to remote recruitment, likely a lure to encourage users to click the malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=how+to+become+a+recruiter+from+home PDF link annotation
    • https://gibetixogi.weebly.com/uploads/1/3/1/6/131636946/8213726.pdfIn PDF document text
    • https://cdn.sqhk.co/vorinugobol/ggUjhbe/anandamela_1426.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/ifkMtjf/nasifinumedoresav.pdfIn PDF document text
    • https://cdn.sqhk.co/supibufuk/hC3oZha/chamma_chamma_video_song_720p.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/ijhbuja/vuxabesut.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/bhfhfLO/lemonurelixuguvewaf.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/bihWgc5/8815313546.pdfIn PDF document text
    • https://cdn.sqhk.co/karelevo/dAghJjj/30350284056.pdfIn PDF document text
    • https://cdn.sqhk.co/kenalutaxi/hgghuhi/nuvixerewanuruzaluzuzoj.pdfIn PDF document text
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/9656598.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/46197207762.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevusup.atwebpages.com/67999210062.pdfIn PDF document text
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_5c274a8a060d402cbaa9b2d90420afcb.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_3c6fe928f9b04fbba5a288b668d5b0d2.pdf?index=trueIn PDF document text
    • http://xowobovu.myartsonline.com/64564622243.pdfIn PDF document text
    • http://botasalipigu.epizy.com/roxamebisefibu.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_3dc238e9c1fe4f74b7143001d8bad53c.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_b9dccb07242942aba3bac5979e7bd38f.pdf?index=trueIn PDF document text
    • http://xamukuxoze.epizy.com/wh_question_reported_speech.pdfIn PDF document text
    • http://bonitadobizaw.epizy.com/dispute_error_on_credit_report.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 5104 bytes
SHA-256: bc7e1e56da928457404d0d1f97f87ea020d4b402c595a909f1c92944691fe7ce
font_01_sfnt_off00010a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A18 9988 bytes
SHA-256: 0bb0e40d69a6d748e8cac56282edc83d0a9ee566cedce46885efe2e4f8c7321c

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