Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c479b3cc4a0024…

MALICIOUS

PDF

70.9 KB Created: 2021-03-21 04:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b82c8121ed02b0b0915fbae4a1282c0 SHA-1: 9afecb789875dbec555aaa50374ec205aa6885e2 SHA-256: 99c479b3cc4a002411d90082dd332ff85aa4406e3f941f943edeaf2cb91f16d2
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or link-farming scheme designed to redirect users to potentially harmful sites. The presence of external URIs and the overall structure align with techniques used to distribute malware or conduct phishing attacks.

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://nipisod.ru/wix?keyword=decrees+crossword+clue+5+letters
    • http://kigadotezolesun.mypressonline.com/12956778184.pdf
    • http://lipuwisapi.mywebcommunity.org/zevezozukozogumedobu.pdf
    • http://bobiruropiles.22web.org/holes_book_worksheets.pdf
    • https://cdn.sqhk.co/modajili/0JD3UAA/call_of_duty_modern_warfare_2_mod_tools.pdf
    • http://shishkin-seed.xyz/elipse_ejercicios_resueltosn6r46.pdf
    • http://avto-document.site/tarkuotu_bulviu_apkepas_su_grybaisfxhqd.pdf
    • https://cdn.sqhk.co/petawelesup/heMjdha/escribir_un_email_formal_espaol.pdf
    • https://cdn.sqhk.co/rabataxuvax/gf6hc9e/world_war_1945_mod_apk_rexdl.pdf
    • http://potuxoposutu.medianewsonline.com/plano_cercanias_madrid.pdf
    • http://zajilakofudo.scienceontheweb.net/ratuxesatuzis.pdf
    • http://bigswinner.space/children_s_nursery_video_songs_freet2ba1.pdf
    • http://fulifubajamo.mywebcommunity.org/nutalozututimasumipodozu.pdf
    • http://bosnoslovnoejelaniekupit.xyz/95877778296ybz77.pdf
    • http://mikrotikwizard.com/aha_acls_written_test_answersxcezv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://megutid.epizy.com/fezixefopok.pdf
    • http://lavisekenesavof.myartsonline.com/80376851301.pdf
    • https://740e8036-3174-4dac-ae20-9eee1cd11a0a.filesusr.com/ugd/0f1c31_a7bab53c3d9847bdb140234ecd892dd6.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_7bce1e654525484cb74ba9ecfa0904d9.pdf?index=true
    • http://bawexoji.rf.gd/diagnostico_laboratorial_da_anemia_falciforme.pdf
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_98d17cecbd1a47308194088caa7e173d.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d80c.bin
150715ee90a7ffd0b79d561b452f9c971088d3581dd32f3e848a84626cb67d9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD80C 4936 bytes
font_01_sfnt_off0000e903.bin
3d053b09c9aef33b2122317ec3abc5e42fb9f2b0fb562a5ef823c86e36b9278c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE903 11620 bytes

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