Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae1962d0fc95570…

MALICIOUS

PDF

74.0 KB Created: 2021-02-15 01:38:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e50dddbd853e667bec7e500f331dfe8e SHA-1: 6bdc4282b7807380b8fcfd47a7ee179158f3abb9 SHA-256: 9ae1962d0fc95570d95bae68e75d07e99292448ae7a43c744501c8e46feb904a
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external, potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be redirecting users to other sites, as evidenced by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://yafferge.ru/wix?keyword=kitchenaid+dishwasher+user+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_600c55264f98c.pdfIn PDF document text
    • https://cdn.sqhk.co/jutusaxibu/gygd1hf/45127566632.pdfIn PDF document text
    • https://cdn.sqhk.co/jopuromug/8ijhfji/best_cracked_screen_prank_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/rokajoten/ijlgfgd/70467990008.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455659/normal_5ffca26bb4edd.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/AOahehg/gta_5_power_rangers_vs_zombies.pdfIn PDF document text
    • https://cdn.sqhk.co/pujazojiwixi/MQgS7gf/plants_vs_zombies_2_garden_warfare_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/giXsjia/coloring_book_apps_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/dhj2WSU/83113881589.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/kisetavuk.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/5Xje9l2/kukedebezatisopek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wefexafunedex.epizy.com/vuruwimijuwo.pdfIn PDF document text
    • http://terujak.epizy.com/rolapam.pdfIn PDF document text
    • http://gulazefedonijo.epizy.com/official_announcement_template.pdfIn PDF document text
    • http://jevoneloz.epizy.com/bootstrap_dropdown_form_value.pdfIn PDF document text
    • http://zutadelunixirot.epizy.com/black_friday_full_movie_hd_1080p.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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 5240 bytes
SHA-256: 6a4226aebb69cf528ccc6e133707480de7565c87a734814d6355c2efb831c842
font_01_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 10660 bytes
SHA-256: ab6b2de72e271db08b7da9344ba9d801b1e14cd5eeb6ed978798ea11f8f4ea45

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