Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23e542180db0028…

MALICIOUS

PDF

78.0 KB Created: 2021-05-25 17:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dcc3e3f2ffc786a2f82c17bbd43e3986 SHA-1: 643d1d6df499cdac389878d1a4abe9d3c8f1320d SHA-256: f23e542180db00282b27ebd3d62ac188bb8b2d4835d67890fae0e101a9514623
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to potentially harmful websites. The document body, though heavily obfuscated, contains text related to 'Sodastream replacement gas near me', likely a lure to encourage clicks on the embedded links.

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
  • 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://static.s123-cdn-static.com/uploads/4456660/normal_6005f95e95752.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4481841/normal_5fe334ab62eea.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/zojejabomonorovosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_604995442179e.pdfIn PDF document text
    • https://nivejuva.weebly.com/uploads/1/3/4/7/134713874/4341608.pdfIn PDF document text
    • https://mevimozow.weebly.com/uploads/1/3/0/7/130776561/tiguzu.pdfIn PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/24c52fcea0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=sodastream%20replacement%20gas%20near%20mePDF link annotation
    • https://uploads.strikinglycdn.com/files/519c6966-66ce-4f92-8e13-38be91bc247f/is_hbo_max_available_on_amazon_fire_stick.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5908f2d7-cf61-4e05-8024-771039272e91/2016_corolla_le_plus_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/768853396.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/46647546496.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/grammarly_for_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/39270013129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0128c6e8-9ca9-4466-874a-a09961a7fdf3/sowajabeleriwigidanariv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2befd7f0-8f99-43ea-a051-1ef8150083ed/xaxobinesunigegavunek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb6c471-d194-416c-b4a9-38f49b67dce7/what_is_101_in_college.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/how_to_sync_elite_800x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6457b80b-ba82-4eb7-9990-406a3e30be39/international_business_machines_corporation_contact_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a2fac4-e788-40a9-929f-b46a8ffdf3f4/wu_tang_collection_movies_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05bbe7ed-a1c1-411b-a231-685c34b0d777/black_max_honda_pressure_washer_3200_psi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7466134a-5e33-4e7e-9fbb-cce3bf829d5c/twilight_midnight_sun_full_movie_in_hindi_download_filmyzilla.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 5236 bytes
SHA-256: bb5f6bd9e48b7d9b49c3e0524fdc2fb6b63015a416aeb3438f138a9fbffb145c
font_01_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 11832 bytes
SHA-256: bffc625a8bf43f9a25011b43f90956485e5ef28a39a9b5b65f911eb7940e92a4
font_02_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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