Malicious PDF — malware analysis report

Static analysis result for SHA-256 0584272afd626f1a…

MALICIOUS

PDF

79.4 KB Created: 2021-05-28 15:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 816634e25e3ce5c6dc9c2c50be416346 SHA-1: bda5689a1b54c284ff82d79e2f63ad4d0d02e258 SHA-256: 0584272afd626f1adfd97a7ae48fe7e60dffc28ce6add4766691190b44b2cb7d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm. The primary URL, https://kuzutuzo.ru/strik?utm_term=un+lugar+en+silencio+2+donde+verla, is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=un+lugar+en+silencio+2+donde+verla PDF link annotation
    • https://kedasolusezobu.weebly.com/uploads/1/3/5/3/135394891/guremanikatog_giwitibi.pdfIn PDF document text
    • https://waronovubuwige.weebly.com/uploads/1/3/4/6/134631102/pedupo.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/miwonomij_fawezoputu_muzema_zubivikuxo.pdfIn PDF document text
    • https://tunivarururi.weebly.com/uploads/1/3/4/0/134041149/15340.pdfIn PDF document text
    • https://desalipi.weebly.com/uploads/1/3/2/6/132681317/9745347.pdfIn PDF document text
    • https://xozisimoxu.weebly.com/uploads/1/3/1/1/131164350/ca2ca6868e5384.pdfIn PDF document text
    • https://luxelekite.weebly.com/uploads/1/3/4/6/134656707/470740.pdfIn PDF document text
    • https://rixifumalig.weebly.com/uploads/1/3/1/4/131437092/1391849.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/bowuriri.pdfIn PDF document text
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/2635548.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/972902d92d64.pdfIn PDF document text
    • https://femadupimasimu.weebly.com/uploads/1/3/4/5/134594559/zejiritomiraf-kusaligagere-sovora-dumetudugeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aaf8ab1-44ce-46cb-9ded-d643e71c1f31/after_books_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372f3455-fd61-4570-b1b1-6a18871c634c/harry_potter_y_las_reliquias_de_la_muerte_libro_resea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6e1d76-5c0f-4df5-85b9-4d1105d26237/nexemugazik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ff86e0-a8c2-442d-b027-4ca9954c2437/90930357599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03713c37-27fb-4fd1-bcdd-20a41618d5a2/how_to_find_gateway_and_subnet_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c022fa80-1163-490f-8aa0-2fbddf491c1e/487000491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6e99c7-dd76-44ab-89e5-5f5edea4bcb2/gisawilidelawimekujiwik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/378f8045-1aac-4c19-9295-1ad7ab2eaa3d/busosones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f38e6b-59ed-44a4-91b9-8184dcb20111/which_yoga_is_best_for_heart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06fe297d-c2f3-41e5-badd-4be820fe53d2/araby_short_story_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4866754c-dc80-44a4-9ba1-2720d8187cc5/ge_nautilus_portable_dishwasher_not_draining.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3ae5e8-e63b-4825-bd66-f6ec2bce439f/who_is_gods_son.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_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 5288 bytes
SHA-256: 586c71ba7f84f9d41dde0b0ea123ef1b55fa39f634609323d245f9e4d8e24acd
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 12612 bytes
SHA-256: 0a946deb7310544f0b434b5db71acfe94b48f365c5c58e9c4e60f38129217a13

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