Malicious PDF — malware analysis report

Static analysis result for SHA-256 5195092974e8a8ef…

MALICIOUS

PDF

77.7 KB Created: 2021-05-08 06:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5476f92ee260d58f040303b8c2965603 SHA-1: 92dfb702f03cd4320d0fe625e8dc7131a1c21804 SHA-256: 5195092974e8a8efad8946939c155fe40a277fd46f3df3dccd8b1a2b5bb06fbf
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://zajinet.ru/strik?utm_term=drinkwell+pet+fountain+cleaning', is flagged as unknown reputation, suggesting a potential malicious destination. The ClamAV detection and ML classifier also indicate maliciousness, pointing towards a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=drinkwell+pet+fountain+cleaning
    • https://cdn-cms.f-static.net/uploads/4371020/normal_604a493d2176d.pdf
    • https://static.s123-cdn-static.com/uploads/4457590/normal_60040faff3e70.pdf
    • https://marotebage.weebly.com/uploads/1/3/4/7/134712984/9425592.pdf
    • https://tisawisapapaw.weebly.com/uploads/1/3/5/3/135326074/jobutivuxenib.pdf
    • https://static.s123-cdn-static.com/uploads/4449172/normal_5fee55e515bde.pdf
    • https://cdn-cms.f-static.net/uploads/4420013/normal_6035ebf3079e6.pdf
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/sifuzotorutivuj-bokarudi-jariv.pdf
    • https://ruwatija.weebly.com/uploads/1/3/4/8/134846771/zoninezato.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/leteraxewe/compare_and_contrast_between_cats_and_dogs.pdf
    • https://uploads.strikinglycdn.com/files/211c9314-fa0b-4a02-8a97-f162e69f610b/circuit_analysis_questions_and_solutions.pdf
    • https://uploads.strikinglycdn.com/files/a0144998-1280-4a03-b91f-ee9607955591/65699516652.pdf
    • https://uploads.strikinglycdn.com/files/2521a216-49c6-4921-8c4c-082d9ec48cbf/this_book_of_the_law_shall_not_depart_kjv.pdf
    • https://s3.amazonaws.com/legapatatezisa/fiction_writing_prompts_5th_grade.pdf
    • https://uploads.strikinglycdn.com/files/986ade14-626e-440d-a779-aa88f5c1529e/parufujun.pdf
    • https://uploads.strikinglycdn.com/files/4c576c90-9aa1-44b8-b460-c002ae8a80a0/streams_in_the_desert_charles_cowman.pdf
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_42574ccf142b404398dbea4045cd8e4f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/69c64f47-8825-45b6-b207-83876568add3/nj_transit_bus_158_ticket_price.pdf
    • https://s3.amazonaws.com/zemigiduwagafu/craftsman_21_inch_208cc_snowblower_manual.pdf
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_0fd1da7941b84967a656106f19882f99.pdf?index=true
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_1e0d8340935c4a6880b8d4b83b9b578f.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f286.bin
792c68029631ea4733bdeeb4ff66fe15684d3a2bc0f7a0f2031a5aded536dbcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 5160 bytes
font_01_sfnt_off00010446.bin
a23c64f556e53c069dc620f6170e0ed05048665176efafe3424d22a07c818fd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 10984 bytes

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