Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a4548b9668f9f6…

MALICIOUS

PDF

95.4 KB Created: 2021-03-03 06:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b3613716c4379997b95514426d2aada0 SHA-1: 8c2adaaa2b614b5832293b0f37f1adbbaa0e48b3 SHA-256: 13a4548b9668f9f6eca4084d132ba43591f4566cda8f8a1189c4c2e8b1376b48
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and the document body, though partially corrupted, contains text related to medical conditions and application names, suggesting a deceptive lure. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://midufefew.ru/strik?utm_term=high+anion+gap+acidosis+treatment PDF link annotation
    • http://maxidaxuwifu.22web.org/ray_bradbury_theater_punishment_without_crime_cast.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410015/normal_5ff4a76cc6024.pdfIn PDF document text
    • http://dikerulaba.22web.org/create_steam_account_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470975/normal_5fcd024988e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_603181811335a.pdfIn PDF document text
    • http://womenit.space/58491203524iuhdf.pdfIn PDF document text
    • http://akvatehnika74.ru/58775416088ipj2u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448328/normal_600a8fefcf62b.pdfIn PDF document text
    • http://nakodinita.scienceontheweb.net/3_letter_airport_codes_in_india.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/gjqR9ko/laweforovawugapitek.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/hc7tjdt/vr_space_spaceship_virtual_reality_roller_coasters.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/nra_range_safety_officer_test_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://solugivewatewa.myartsonline.com/how_to_use_live_bait_for_bass.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/89578894950.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/xefupisalufo.pdfIn PDF document text
    • http://kiwizenodemi.epizy.com/shadowrun_returns_best_story_mods.pdfIn PDF document text
    • http://kegigija.atwebpages.com/rebapuluwegag.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/huckleberry_finn_audiobook_chapter_38.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/5026042322.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_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 5416 bytes
SHA-256: e7889e90301714838f972156379d9b6a62c21ea131c42cdeb148464a4f557dec
font_01_sfnt_off00014980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14980 11296 bytes
SHA-256: 129939fcd408e2a64ee2f35f917ec7654f634b14a62354f15870fbc95d070199

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