Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dd466a7f229b19…

MALICIOUS

PDF

77.7 KB Created: 2021-02-26 00:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 17618706645ebd2c41183d2ecf5ef255 SHA-1: 1cd84c5f3b73120e71fe2ee5c9751e905a49548e SHA-256: 98dd466a7f229b19487a527bd9f00a7251c9711592d8c01f02761b41ba1f1bf4
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains a query related to Fitbit syncing, which is likely a lure to encourage users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://maypoin.ru/wb?keyword=how%20do%20i%20get%20my%20fitbit%20to%20sync%20again PDF link annotation
    • https://cdn.sqhk.co/rifarako/jbiikN5/marketing_strategy_training_courses.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/iahcFiM/guide_and_free_diamonds_for_free.pdfIn PDF document text
    • http://zagavuxowipoj.22web.org/bhagavathi_film_ringtone.pdfIn PDF document text
    • http://youtube-subscribes.com/effect_of_alloying_elements5tfsw.pdfIn PDF document text
    • http://waxokuvinati.iblogger.org/77389213112.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/jiaibuV/penguin_simulator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/vejurumilef/hicjfR0/last_island_survival_mod_free_craft.pdfIn PDF document text
    • http://gisaxisiburu.66ghz.com/varajizof.pdfIn PDF document text
    • http://gatorama.fun/rayovac_ps13_charger_instructionszznx7.pdfIn PDF document text
    • http://taxokisekajetek.22web.org/facebook_app_install.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/vQibjct/busasurotevogibobawi.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/ibgfcEC/ghosts_of_mars_2001_watch_online.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/tezofuretejom/sample_marksheet_in_excel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/45831576915.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/ejemplos_de_monografias_con_normas_apa_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kotidox/factors_affecting_consumer_behavior.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_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 5508 bytes
SHA-256: 06f628ddb9c8ba220789b6a231a3f071fe30e936440b56dbc8d0a9ef57d965de
font_01_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 10012 bytes
SHA-256: 30111ea0d6d22e91780c9a4309c67c599fe03d698466fe9fd0ec411aaf14bffa

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