Malicious PDF — malware analysis report

Static analysis result for SHA-256 923e2df47bb47949…

MALICIOUS

PDF

78.7 KB Created: 2021-05-30 20:40:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 67492a4fd182771ec9b0a12079c30f77 SHA-1: 855fa043ec7ea013489f32e701dfa6c32355af64 SHA-256: 923e2df47bb479495d5c93406194f4b6b93f3f338092b50b31132d4c6f55e4f9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV detected the file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The embedded URLs, such as https://golowaki.ru/strik?utm_term=arrebatos+carnales+2+descargar+gratis, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=arrebatos+carnales+2+descargar+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418791/normal_6008db4b142d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448535/normal_60476ed6a36f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_6044cb763a8e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5ffde08883e5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388827/normal_5ff9301a9d0af.pdfIn PDF document text
    • https://rajuwirorevub.weebly.com/uploads/1/3/5/3/135306937/450755.pdfIn PDF document text
    • https://kuwodugedo.weebly.com/uploads/1/3/0/7/130739904/diwipegar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_5fd1248cb71a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_603bf1cf5a13c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fd36ce7cf7fd.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/7b0847df-16ef-4177-ba0d-29c160e4681f/ao_smith_promax_electric_water_heater_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b1b3b0d-8db2-48d7-8056-8dc1cb06a335/45708113512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b471d840-bcfa-4a4f-a5e1-b55af276f07f/what_is_the_rarest_patronus_on_pottermore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36c92c4-cf7f-40a8-9f28-ff08a3128241/83256533046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84985bb0-f9b9-4c3b-9fdb-3104e0df14f0/charlie_and_the_chocolate_factory_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f753b3-d247-4db7-9654-d1ddc9d4708d/kekati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e316921a-e954-49c6-ab1a-a8d545c9eefe/not_my_cup_of_tea_meaning_in_arabic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222d15eb-f5fa-4924-b177-2b97fb3ef71d/how_to_treat_acute_pulmonary_edema.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52a92de6-54a2-4a23-8e57-8f68b27a41a9/67126775147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed2704a2-2f26-4509-b969-abe75a940a39/kepadoxex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99be5005-57e5-498d-af38-a7df603f7a84/42868602269.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 5368 bytes
SHA-256: 3db2a66a61fb607190445666c5003a14b74dcd51597e95a51d7f2ca9e66001f7
font_01_sfnt_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 12640 bytes
SHA-256: 688351c2bf0b3558f244b0eebde13963f4ecb41af1ff0de3f3396c3b44c977ee

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