Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f7038d6cd2f7af…

MALICIOUS

PDF

76.0 KB Created: 2021-03-06 16:36:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2c71c70ec0e508c3a483e4b3a0a5053d SHA-1: 0a7695c905c3c343ba4fd253f7f7654f486da067 SHA-256: f5f7038d6cd2f7af13d5bd808a68295ce2d65101a0764eb8e7b93e24266596db
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains a search query that likely serves as a lure to encourage users to click the embedded malicious links.

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://vilenefex.ru/award?keyword=why+are+my+bathtub+jets+not+working PDF link annotation
    • https://cdn.sqhk.co/delojiwuguj/tjhihhU/50422224515.pdfIn PDF document text
    • http://bavomobes.22web.org/meposamiwevuzabixokalugez.pdfIn PDF document text
    • http://sexafilavu.iblogger.org/xozesutezowego.pdfIn PDF document text
    • https://cdn.sqhk.co/jifonakilux/MgcuZgh/elements_therapeutic_massage_spokane_wa.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/WRYXjan/faxetejafebuzitida.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/jibjggd/electrical_wiring_schematic_symbols.pdfIn PDF document text
    • http://cocobuka3.xyz/18526253539xkid6.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/gihFih6/84497545434.pdfIn PDF document text
    • https://cdn.sqhk.co/jenuluvonuz/eBSohce/dedazonitugekudewivas.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/Ojbhhhi/wild_west_redemption_gunfighter_shooting_game.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/22408137163.pdfIn PDF document text
    • http://bbflowers.net/comma_or_semicolon_2_worksheet_answers8ec4a.pdfIn PDF document text
    • http://wetiludivarag.scienceontheweb.net/tumolafulidegar.pdfIn PDF document text
    • https://cdn.sqhk.co/jarebomu/pntVibZ/libibetasakowafasud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca2c045-43c9-4dbb-a128-2b30fdf36c88/68027682240.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e6b9b5-4d24-4346-9743-2d2cd0364f19/tropic_of_cancer_latitude_is_largely_covered_with_forest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c21f0af-5503-454a-96e1-115734064e5c/are_colleges_worth_the_price_of_admission_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659c5295-6508-47a1-9ca2-62c7beb0aece/lagurepogevalepuv.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_off0000ecb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 5552 bytes
SHA-256: 69bdd96c9268bfc7bfde511f3e88f88f86045a68ca9f9035de151fda294914a1
font_01_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 10396 bytes
SHA-256: 9a50e01c24537808987b94b03175c6c0f6a98f9d5a7d45f2e8fb2418bb540652

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