Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec18b2f9bb0aa1a…

MALICIOUS

PDF

76.4 KB Created: 2021-04-04 18:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0a4829091fb7f30e6126760e57b28776 SHA-1: 98604b8daf618708452fe8907e0f118ff85f79fe SHA-256: bec18b2f9bb0aa1a4efda93d7b633b7f6091b5c782f7308c18eb5a83f843032f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identifies it as a link farm designed for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://jumiwimov.ru/aws?utm_term=air+force+academy+application PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378151/normal_60698327eb2c8.pdfIn PDF document text
    • http://thailandlove.site/38742482080rpyqe.pdfIn PDF document text
    • http://fuwefepor.iblogger.org/61558274480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_60300b5dc749a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_600b11a727e97.pdfIn PDF document text
    • http://copyrighthelpptteam.com/koziwuliladadukodoneg64kbh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417046/normal_6046fd2f29994.pdfIn PDF document text
    • http://help-copyrighteamservice.com/oxford_advanced_learner_dictionary_10th_edition_free_downloadh5qpz.pdfIn PDF document text
    • http://spiritstudio.ru/how_draw_portrait_step_by_stepcjkee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_60105a817c2b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_60262913029c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_603d7b554b44c.pdfIn PDF document text
    • http://byseles.xyz/minecraft_guide_to_redstone_free_downloadb4ybe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewenofos.epizy.com/teamviewer_min_ph_mi_nht.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/sebi_icdr_guidelines_for_ipo.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/hydraulic_jack_project_report_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/vapegoxiguxidebivudapor.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/autoit_for_selenium_webdriver.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/star_trek_movies_cast_2016.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_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 5212 bytes
SHA-256: 997df34fb4b97bb16f20c29baeb1a3bd574707db704d04b3fb87f8be5abf98a8
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 11360 bytes
SHA-256: 3deae1d715b0f31d3cbac747cb7a8389768de4400018f28fc2527a367d73f73e

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