Malicious PDF — malware analysis report

Static analysis result for SHA-256 16696983b330a0ea…

MALICIOUS

PDF

80.0 KB Created: 2021-03-11 04:19:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f975d085609dfd1000cc694120ef4f26 SHA-1: 1adbd3e1a6c97e0df79edff07418bef031b60ddb SHA-256: 16696983b330a0ea2bb30755746a40de6b8c1091145625b40b6d327cd52f90ca
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 0.9997

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://gimoguvi.ru/strik?utm_term=are+green+smoothies+good+while+pregnant PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392441/normal_6031e92e8dba9.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/tarot_card_love_reading_in_hindi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480897/normal_6043100a4fbf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470962/normal_5ff32f17ccc12.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/tafsir_ibn_kathir_download_bangla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_600b1e9789aa7.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/differences_between_big_little_lies_book_and_show.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426820/normal_600f932686407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_600e9905d85f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_603533c77a3a5.pdfIn PDF document text
    • http://tupaxeguna.scienceontheweb.net/71080650316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_604507675a0c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gixejemazob.myartsonline.com/implicaciones_de_las_inteligencias_multiples_en_la_educacion.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_43f6f9d77f464346b56af2528509e39f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/23cba59c-135c-496b-8f47-c9bb38a584b0/81611887686.pdfIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_5d53aead388a4e89901e15ce5b70b9de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46191217-e4cf-4ed1-967a-0ffd740637d0/washington_dc_city_population_2020.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_321cd5908f5b4b93a3104eecce08e42e.pdf?index=trueIn PDF document text
    • https://6c892e0d-5736-4b4a-96a3-cd490fd1fe3d.filesusr.com/ugd/1407cd_229ad95f04d34de5825c666337b91b97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/262839d4-ef52-4799-9665-4b20b23a0f83/rotutovazixodosoj.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_c6bfe3d37d0245e58cd5e9eb12dfeb8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/03be3310-302b-4099-a052-003bdce6fe42/bujamuzupovemibagoponife.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_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 5456 bytes
SHA-256: 6d4c571dedf0c7a6485a34dcb584b21e9a47eeaab5223b065795b45064372912
font_01_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 11180 bytes
SHA-256: d9b7f2eaf55f943c18cffce59b64b9c4b017b0a036a8574da276f8d6e17d17ae