Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d18e4a8eaa2982a…

MALICIOUS

PDF

77.6 KB Created: 2021-03-26 11:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee4100726d14acc8d7cb5c44b8a41e7d SHA-1: 24f7727b8a4a302fc50c9a4322d563f0d49d8877 SHA-256: 7d18e4a8eaa2982a0106cbbc8fa58bc34cd79e40a148fa62cffe0ebb65b7a48d
134 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a phishing lure, specifically mentioning an 'invoice or payment language'. The embedded URL `https://jumiwimov.ru/123?utm_term=colorado+unemployment+insurance+tax+report` is a primary indicator of malicious intent, likely serving as a phishing or malware distribution point. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jumiwimov.ru/123?utm_term=colorado+unemployment+insurance+tax+report
    • https://cdn.sqhk.co/lapefuxolu/jdjeUjg/7707541363.pdf
    • https://cdn.sqhk.co/zodenizekija/hefBhdZ/gbox_mall_compras_x_interneta.pdf
    • https://cdn.sqhk.co/sawusuzi/jjhjriI/electric_stabilizer_jack_manual_override.pdf
    • http://jerimujolegem.medianewsonline.com/adapter_class_in_java.pdf
    • http://melodabogaso.66ghz.com/91782359062.pdf
    • http://tuderoba.getenjoyment.net/lodurudijovafi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_44f0ddc882bf4502a6d920db2a0a095c.pdf?index=true
    • https://s3.amazonaws.com/vobuturinivi/infectious_disease_society_of_america_mrsa_guidelines.pdf
    • http://sitafefisoju.atwebpages.com/goluvijumekunujul.pdf
    • https://uploads.strikinglycdn.com/files/694a81d3-9f0f-4d5f-9767-65cedbd70beb/woluxevofenuxored.pdf
    • http://jamopuv.epizy.com/perdagangan_manusia_adalah.pdf
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_cd824efadac84d7cace4ecd08f90083b.pdf?index=true
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_2fa6344775d24ce5adba276e5886c943.pdf?index=true
    • https://s3.amazonaws.com/fajixe/639328536.pdf
    • http://kojawuze.epizy.com/hemoglobin_c_disease.pdf
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_0a33a56edbfd427eab6b1f7d8cdc3f10.pdf?index=true
    • https://s3.amazonaws.com/metakibeme/arputham_songs_starmusiq.pdf
    • https://s3.amazonaws.com/redegelesibif/finding_square_roots_using_prime_factors_worksheet.pdf
    • https://s3.amazonaws.com/bededuxotulapil/biwexarotitiru.pdf
    • http://duvufewitopemaw.rf.gd/63638007663.pdf
    • http://sapirabiv.rf.gd/las_flores_del_mal_poema_al_lector.pdf
    • https://uploads.strikinglycdn.com/files/d350fe6b-2037-436b-a45e-fad12d1e754c/58590444718.pdf
    • 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_off0000f175.bin
6bb5020420d9faee96726a44e67c8fcb64f7c1b86746503b12bea44ef5f31576		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 5292 bytes
font_01_sfnt_off00010366.bin
6ff25ea3fe73bfc971c49291398b1c419555465ad62c85b4d14b8b6a465c9c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 11260 bytes

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