Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1253c4a80361bba…

MALICIOUS

PDF

71.9 KB Created: 2021-03-18 15:52:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 630ba4d2e5cb9b07b9f9a6c0021aa843 SHA-1: 257e6fbe9f0acccf966a31eb9625e5a6436db805 SHA-256: a1253c4a80361bbac613cb06399830d29d8721eaee7a9a46c00f700ed911d7cd
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external domains, with heuristics indicating it functions as a link farm on disposable hosting. The primary purpose appears to be directing users to potentially malicious websites, aligning with phishing or malware distribution tactics.

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://soxebez.ru/award?keyword=boulevard+of+broken+dreams+bass+pdf PDF link annotation
    • http://sunny-web.ru/geometric_transformations_practice_worksheetsy4zdn.pdfIn PDF document text
    • http://wow50.pro/63049471362777ja.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/hdQNpRC/fikazulizobelalakosugag.pdfIn PDF document text
    • http://vimabanu.sportsontheweb.net/lezab.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/O0hfHkI/9283771470.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/LPM9iec/impossible_nine_2048_puzzle.pdfIn PDF document text
    • http://finansi-7.online/wutijefulupegorobavotb1ll8.pdfIn PDF document text
    • https://cdn.sqhk.co/tepikipo/XQnzgeo/payment_request_form_mcgill.pdfIn PDF document text
    • http://urro-hu.com/22612001729tqi17.pdfIn PDF document text
    • http://xujaxul.mywebcommunity.org/william_blake_songs_of_innocence_holy_thursday.pdfIn PDF document text
    • http://job-finder.space/used_motorola_xts_5000_for_saleohcy3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_cbc7eb49973f4a3aa70e37fba4ec9403.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_0917d283083c40c8b7f13876565b38b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff35937-b72d-4590-ad94-1f7e4c4a7e9e/google_maps_live_view_beta.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_92fe4332dbe0414eb84f9d6d3f7f41d9.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_bdcf98f64ae04086a75f66b4339f6410.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd680c7a-e626-4397-adf9-2e6787539470/irobot_roomba_960_vs_980_review.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_c0f8209484134f3cb7676bf6d8e94f5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7f7c722-608a-4bf1-b99a-097a363ed271/kebaxiwunoje.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_off0000db6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6F 5500 bytes
SHA-256: bd23786215fc00cbd4a594c2778dabfb19e836a3ba458b6365f3088264337f66
font_01_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 10516 bytes
SHA-256: 89533abd265444b896d90309090994a47fe6f4ebd4377405287fdfb4fbf70bbb

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