Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6a0f6dbaada924…

MALICIOUS

PDF

76.6 KB Created: 2021-04-12 22:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4b1f49b42728ef41f81a2b66d2ac65b9 SHA-1: 77fa62cb96dbb4f935b1d43011a390b93a29dc20 SHA-256: 5f6a0f6dbaada924924941994670c459cbee0f7ea5b1d45a114a844ebbbfe20c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with several pointing to suspicious domains like maypoin.ru and dle-tpl.site, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is designed to host a large number of links for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=what+size+tires+for+2005+subaru+outback PDF link annotation
    • http://dle-tpl.site/extreme_landings_apk_modjbmwf.pdfIn PDF document text
    • http://dkblogin-de.best/jufijil5mujr.pdfIn PDF document text
    • http://x-bionic.shop/android_tv_oreo_on_pcz6e5l.pdfIn PDF document text
    • http://discount50it.pro/205967367880v7lm.pdfIn PDF document text
    • http://technodom11.com/mirazuzasudorutakoxivuvepb3zkw.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/3009703561bcu7v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ropuba/ibm_spss_statistics_25_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/81617530056.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ef18a3-980e-4336-8169-9041e23c543f/9595378203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11dcd277-79c9-486c-a92a-2078772e7630/wujokufafavesevozukan.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/57500606079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cde18cc-7755-4cb4-8b9c-9c12574738d3/the_last_jedi_script_springfield.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a250a47-28b9-4598-95fe-d82d7674197b/xunevujuzarevamajamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deef059d-b631-4813-bd9c-88ad67448629/4584145026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887d9376-5866-4e35-a5e2-77f0490c3f84/2nd_grade_comprehension_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/squat_form_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/cook_eggs_in_oven_on_cookie_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/83342631881.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_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 5604 bytes
SHA-256: b05f156f7214be250422776bbd10bb03b6dca32f57b42f25fa997b27ee1f0fc9
font_01_sfnt_off0000ffa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA2 11160 bytes
SHA-256: 7b32d2a234832d1c50dcc800fe8dec87f705669c5cd34fc01fd1452500ffc1fa

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