Malicious PDF — malware analysis report

Static analysis result for SHA-256 43747228133b4ec0…

MALICIOUS

PDF

78.3 KB Created: 2021-03-19 07:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6e48a751797d9b909bbbab7174fd406f SHA-1: c3de50f1b74d3947663e19dbc8d0c257bd1e93be SHA-256: 43747228133b4ec0eb5baff404988a0313c2c22eb3e7ef50d2830a5179cd90a9
186 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, identified as a link farm. Several URLs point to unknown or potentially malicious domains, while others are marked as confirmed benign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/wix?keyword=urban+outfitters+size+guide+skirts PDF link annotation
    • http://romeital.space/love_story_sheet_music_cello0a3il.pdfIn PDF document text
    • https://goginaderexikez.weebly.com/uploads/1/3/5/3/135306094/deron.pdfIn PDF document text
    • http://hq-cleartv.info/westinghouse_roaster_oven_manualuld9v.pdfIn PDF document text
    • http://trastenmyqort.online/lego_star_wars_character_encyclopedia_2020_reviewkjoix.pdfIn PDF document text
    • https://xujuwoxevosu.weebly.com/uploads/1/3/4/8/134896670/begulonuli.pdfIn PDF document text
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/2de6bd90394e81.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/5446286.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/be3da081f40e8.pdfIn PDF document text
    • https://tivepikilusu.weebly.com/uploads/1/3/4/7/134759048/60b9091.pdfIn PDF document text
    • http://testrun.ru/how_to_wrap_a_shoebox_as_a_gift_boxpp6qi.pdfIn PDF document text
    • https://xiduzejeg.weebly.com/uploads/1/3/1/6/131606953/fajodejagod.pdfIn PDF document text
    • http://idealica-co.site/cuisinart_brew_central_dcc-1200_manualgdxat.pdfIn PDF document text
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/widuvizelori_nujezud.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/e8462c95-3a4b-4239-96e5-49a4ad53e8cc/60497660355.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/42160824562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be6f4ec8-3963-4aae-9818-3a8e8c220c46/vovoxiguxugudadigukoti.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/alsons_aws_information_systems_inc_accenture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/597ee386-4aee-47e9-a5e7-9b933f80f7f4/21670011934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c1dd9a-47fd-467f-bf11-f6a7d43f22fa/sazobesoponifemetonug.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/97438273464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f6d398-c43d-4658-872c-d23c7bb6dcd6/introduction_to_machine_learning_with_python_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56155c0f-2058-40f1-92a9-ab3653407059/chrono_trigger_snes_cheats_game_genie.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/57961810348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91514ae7-b921-408a-98e9-4a88fb11a1c5/after_we_collided_soundtrack_spotify.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/36581365281.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_off0000f0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BC 5288 bytes
SHA-256: ffae3908884d65ca5342747d19fa271fee06bc30842f5d1d829fb31cb3c10a02
font_01_sfnt_off000102d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D3 11960 bytes
SHA-256: 6ec1663e4fda274b8648395a8410fd5bf71da4d734cd77226a8fa44090c09637