Malicious PDF — malware analysis report

Static analysis result for SHA-256 273af8ff4e45634e…

MALICIOUS

PDF

71.8 KB Created: 2021-02-03 04:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 98f4cf9f8baabc98c497f4f656092c42 SHA-1: fa94ab4671f2236976cd7120e8a00ab8f496ec5f SHA-256: 273af8ff4e45634e0e782e8f473c0aa690ebe23980c07ae479135228931870e9
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Little house: the last farewell', likely intended to trick users into clicking the malicious links for phishing or malware 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
  • 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 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://crophysi.ru/123?utm_term=little+house%253A+the+last+farewell In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485308/normal_5fe95239c1f21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5fcf9d5fa1667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481166/normal_60116ee1ebd94.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/bhjghih/anime_furia_de_titanes_3_temporada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5fd6647e3b9e0.pdfIn PDF document text
    • http://rilotelexewobos.iblogger.org/32946845169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490252/normal_5fe57fed2f63c.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/TzMeWgh/sobidesivopavipinubegi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_60036cd104ea8.pdfIn PDF document text
    • http://gukimunejorupod.iblogger.org/honeywell_wireless_smoke_detector_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/ratevusur/hhzicsG/zombie_diary_2_hack_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzalolotagi/HBhfjhg/fall_guy_truck_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufizomofoduzin.rf.gd/disney_cello_sheet_music_free.pdfIn PDF document text
    • http://zefixufedinokas.epizy.com/template_layout_page_asp._net_mvc.pdfIn PDF document text
    • http://dilabopitomosif.epizy.com/fapozobavekugeni.pdfIn PDF document text
    • http://toxawilel.epizy.com/letudegeraluro.pdfIn PDF document text
    • http://lenixad.epizy.com/system_requirements_analysis_template.pdfIn PDF document text
    • http://xilawon.epizy.com/35275521573.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/8502473203.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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 4940 bytes
SHA-256: 94d951f37ddca37083b08b1149f6cebf25f0f9a370e162ca448fd77d98cf716e
font_01_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10428 bytes
SHA-256: a9bf7e72cfb4c2956cf2322c705203f2218fb1a9f44190eb0a9e01ebb082fed3

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