Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a57a1851950b7e…

MALICIOUS

PDF

70.7 KB Created: 2021-02-27 14:47:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: bbad32d98f381d302e98889d00336d35 SHA-1: 5226a96ff8982e96a1405f2c7a58b1516b65621a SHA-256: a0a57a1851950b7e6bb0c4cc8999ebc2f36da1a6d733587afab30fa13eac5518
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

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://pelibifir.ru/wix?keyword=what+is+the+answer+to+8x8x8 PDF link annotation
    • http://vbruti.site/pedometer_step_counter_weight_loss_tracker_apkj4jio.pdfIn PDF document text
    • http://shoop-fo.ru/151861054789p5ik.pdfIn PDF document text
    • http://medefoduma.iblogger.org/23322587508.pdfIn PDF document text
    • http://honey-love.ru/nfl_game_tonight_point_spreadvx91y.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/UhiZKhg/87433012627.pdfIn PDF document text
    • http://usecabinets.xyz/bose_companion_2_series_iii_multimedia_speaker_system_pc6fzj0.pdfIn PDF document text
    • http://twirlini.com/lizukugalesazenelckt7.pdfIn PDF document text
    • http://cafe-cok.ru/readworks_a_well_kept_secret_answersp57we.pdfIn PDF document text
    • http://nudazizefa.22web.org/sezuxoselipibisadimez.pdfIn PDF document text
    • http://zumarez.22web.org/xonamoxesokematosape.pdfIn PDF document text
    • http://keto-menu.online/pepper_iron_man_suithjmus.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/oCiec6z/new_family_house_builder_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/23558977570.pdfIn PDF document text
    • http://rowesotinik.rf.gd/sijimisebulinikaritifu.pdfIn PDF document text
    • http://fujatelet.epizy.com/kokokalurutipanefidason.pdfIn PDF document text
    • http://sonisan.epizy.com/tentative_date_sheet_ignou_december_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/insomnia_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/agriculture_durable_en_afrique.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/english_101_college_book.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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 5108 bytes
SHA-256: b5cc32e00eef5ea78e51fa7a28e1907188f8dba26ee8951e637e026e05fc5d78
font_01_sfnt_off0000e8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C0 10716 bytes
SHA-256: d6553b957766ace0ffb197c3d132f51ed8a20cec3a197f41c264da5f8afb4718

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