Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc53fe077021358…

MALICIOUS

PDF

75.9 KB Created: 2021-04-15 17:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d253b46fde1a6c7e72a5f4d96057acc9 SHA-1: d1914101e0e9d646627539f877aac4c71605d902 SHA-256: 7dc53fe077021358ee29cb1817f307788a59dcd1bd657e791bf83c1afb52110d
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 pointing to disposable hosting or redirectors, indicating a link farm designed to distribute malicious content or phish users. The presence of a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK and the ML classifier's high confidence score further support this assessment. Although no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to redirect the user to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://crophysi.ru/strik?utm_term=what+kind+of+condoms+cause+uti In PDF document text
    • http://sait-ok.ru/baruxibolidemigasukujetamfm4uv.pdfIn PDF document text
    • https://xezafeliwi.weebly.com/uploads/1/3/1/3/131381443/2488200.pdfIn PDF document text
    • https://meradajo.weebly.com/uploads/1/3/0/8/130873906/vegumiza_gujulov_getapuneraka.pdfIn PDF document text
    • https://cdn.sqhk.co/gixegusu/y3tjhgm/retroflag_gpi_gameboy_advance.pdfIn PDF document text
    • https://cdn.sqhk.co/wozejodes/hhjfKNw/windows_movie_maker_free_video_editor_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/gsghNYo/children_s_blocks_font_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wovovoteg/CANiehg/zetefijoxinulawagegemiw.pdfIn PDF document text
    • http://ourfanz.com/1967_ford_mustang_shelby_gt500_for_sale_australia0aghz.pdfIn PDF document text
    • http://dobewobezusisof.iblogger.org/11661059178.pdfIn PDF document text
    • https://lenagabonozizaj.weebly.com/uploads/1/3/4/3/134314127/lawur.pdfIn PDF document text
    • https://rikedinodewo.weebly.com/uploads/1/3/5/3/135323941/xoliwosozawuxe-xanumebura-xarazuzirud-pesutikanafalu.pdfIn PDF document text
    • https://cdn.sqhk.co/livefodam/kwhjlKA/12694495843.pdfIn PDF document text
    • https://jegetujo.weebly.com/uploads/1/3/5/3/135300600/zovelota.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/fuwuzerijofa/war_of_the_worlds_epix_season_1_ending_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/fox_furry_ref_sheet_base.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/37273439177.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/chemdraw_online_free.pdfIn PDF document text
    • http://tunizalureb.rf.gd/subufukefagifogadiro.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/gatet.pdfIn PDF document text
    • http://mugoxox.epizy.com/25407376189.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_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 5212 bytes
SHA-256: c73ed669a69edc0f986fab6a506a592dfa6633d50f23b87de62082fd60436849
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 10768 bytes
SHA-256: f43909e1c9a0decedd56e139c9bb6b8e6f2542a34360f5ce0bd4ef31badfab77