Malicious PDF — malware analysis report

Static analysis result for SHA-256 0639701ed0458011…

MALICIOUS

PDF

79.1 KB Created: 2021-04-14 00:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a897e0bb5761cb2d96ac465301f6e6b9 SHA-1: 59c30fdc72c41b48f3a15797080d9e278da8ea2e SHA-256: 0639701ed0458011d7782e9fc7b00346ac5b0fb09ed49d92a10e80df3f830752
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+do+i+connect+schwinn+ic4+to+peloton+app PDF link annotation
    • https://cdn.sqhk.co/zezinojox/ajdfhgF/how_to_play_among_us_online_pc.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/tom_clancys_rainbow_six_siege_guide.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/46273320674.pdfIn PDF document text
    • https://cdn.sqhk.co/dibatafuba/kfWNmT1/73835374095.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/eGhbWjc/busuzikevitijete.pdfIn PDF document text
    • https://cdn.sqhk.co/parepejapoki/hf5MykP/history_of_south_africa_apartheid.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/wpf_tutorial_kudvenkat.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/9jfjgXL/8648944590.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/gurafoga/totoxado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71024f05-2f27-43c4-b1c9-e3786e5342ce/how_to_calculate_cm2_of_a_mirror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b1f5dbe-5410-4750-ac3d-534dd0188229/paint.net_transparent_background_plugin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/330cbc78-edae-4246-a383-7cef6bf41dfd/g35_automatic_transmission_fluid_change.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_a5745599ee5b48d1b4592f4e7c583fd4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6b0d45-7781-42db-9cfb-dda98609aefb/xamivefezaneke.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_5c7d52b74c1b4d7d802cd94ed9da29ef.pdf?index=trueIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_b07a317448a845d9828521a52f4622e2.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_8c55350d383d4d8cb1964aa8554c4b51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/najubu/jugofezavitipi.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/79403662279.pdfIn PDF document text
    • http://tumobuwixakeg.atwebpages.com/ge_dryer_error_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5a3bc2-17a0-48b9-ba1b-3a79e704bc0c/what_are_sodastream_bottles_made_of.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/formas_de_aprendizaje_visual_auditivo_y_kinestesico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef65d4a-82b4-4853-abbb-c3a685c00daa/waxirinuxenilaxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d23d25-21ac-4306-aca6-9a7df1c4eeee/escriba_una_definicin_propia_del_aprendizaje_basado_en_proyectos_abc.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/42120030405.pdfIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_6dc17408c42a4f60b87d82319442f792.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba546e62-7a4c-44c7-8852-e07d18def00c/how_does_memory_mapping_work.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_off0000f5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E9 5204 bytes
SHA-256: 4e0accebc84c83465151723ddb80c333aada8ccf3f892c8ced52706336a6884e
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 10900 bytes
SHA-256: 96356e432bb688435881a920c645c39d27883fce64f64aeadbd0e34effae0ad6