Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f451de0ba0d048…

MALICIOUS

PDF

79.0 KB Created: 2021-04-04 23:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4b0cbea4f3b4ea0778485c2041b42963 SHA-1: 46413e94fdfad009356481210b0171739d7d971d SHA-256: 17f451de0ba0d04884313e310d3fe43b72871fdc1d4d527626772b8145d1c913
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent URL suggesting a lure related to a Sony camera. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, often associated with phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. No scripts were extracted from this sample, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://jacksth.ru/strik?utm_term=sony+dscw800%252Fb+20.1+mp+digital+camera+memory+card PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449000/normal_604b2a63c5bdd.pdfIn PDF document text
    • http://poguferuliwu.iblogger.org/mother_of_the_bride_speech_template.pdfIn PDF document text
    • http://mokugujumekov.sportsontheweb.net/boxawi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450724/normal_6003171292aef.pdfIn PDF document text
    • http://torixobo.mypressonline.com/zawomop.pdfIn PDF document text
    • http://fonujameritules.getenjoyment.net/rentabilidad_y_riesgo_financiero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453326/normal_6057bf88daa0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_60555c04b57d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5fe42d9c2e3ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384036/normal_5ffd01b0c8d37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474218/normal_5fcff2aac6ec5.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/opposite_of_always_free_download.pdfIn PDF document text
    • http://gijofabenetawix.66ghz.com/abcd_movie_song_video_mp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_5fd7f6fad2c3d.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://lexireto.epizy.com/internet_explorer_8_for_android.pdfIn PDF document text
    • http://pojenuza.epizy.com/all_animals_name_with_picture_in_english.pdfIn PDF document text
    • https://25cf7bc6-226b-4013-96fa-c64d334b7dac.filesusr.com/ugd/317e1a_4988db86ad8b4cf29defeba532b31369.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_2d77e174c5d648e7b5a172e663bb3556.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71ebf94-7c4b-4c2d-81e4-b1ed2544cc3c/zivimajezerujov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a31e99-ff6f-45bf-a7d8-6c185f4e93f6/sentence_construction_worksheet_grade_1.pdfIn PDF document text
    • http://kisalonokexiwi.atwebpages.com/craftsman_professional_radial_arm_saw_for_sale.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_off0000e6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 6208 bytes
SHA-256: d2bf24f0406c306f1881bac1331bdfb39dc0d3df40a71e5b6c4e1366c30b3b97
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 10688 bytes
SHA-256: faec2750be9f5d97bf237311a55d4019793707cf1d81573d8d0feacd36f31bc2
font_02_sfnt_off00012043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12043 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378