Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e2c3c1545095f8…

MALICIOUS

PDF

75.4 KB Created: 2021-02-26 18:27:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a12b1886109a2e9c4082ad1b7835f034 SHA-1: 9c4fe9770293cf121285f692a689e36bf6cee9d8 SHA-256: a3e2c3c1545095f8f981526fde04649e192fe5e74d92b1dace9c7f34ab0d5289
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the ML classification strongly suggest malicious intent.

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://gimoguvi.ru/strik?utm_term=thank+you+mom+quotes+for+instagram PDF link annotation
    • http://ginosolatowu.iblogger.org/sorabaweruvarifu.pdfIn PDF document text
    • http://50offstore.info/ameloblastoma_plexiformewosoz.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/root_samsung_galaxy_s5_active_att.pdfIn PDF document text
    • http://2220202.ru/reporter_definition_filmaygt2.pdfIn PDF document text
    • http://yellownatural.space/majesty_2_full_version_freeranm9.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/3hjiaHK/snapchat_logo_red_aesthetic.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/bhbjh5p/fm_radio_transmitter_for_church.pdfIn PDF document text
    • http://punejew.mygamesonline.org/84184466196.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/how_to_identify_an_ash_tree_without_leaves.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kitasiru.epizy.com/aprender_portugues_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/update_android_box_to_android_9.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/briggs_and_stratton_small_engine_replacement_parts.pdfIn PDF document text
    • http://zekakodususebu.epizy.com/rovufiboneba.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/zitajivusebup.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/halloween_reading_worksheets.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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5392 bytes
SHA-256: a8b74363e0f92ad6bd5943115a71a86625c615e3888927001a935442f276223d
font_01_sfnt_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 11412 bytes
SHA-256: c5a82e0338a3deceb77cffc1265edadfa573ce6a66b0bbd122b84aa6d84cf447

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