Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcc97da269795a2…

MALICIOUS

PDF

80.4 KB Created: 2021-03-14 07:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: efced423f66d43ff64256efbdaf39550 SHA-1: 962fd167b880b227f381cc33e3f30950d0e304a2 SHA-256: 9bcc97da269795a2e67fd8442960c09fcc95946ad7399dcd814482abf12854a5
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 0.9990

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/award?keyword=tulsian+accountancy+class+11+solutions+pdf PDF link annotation
    • http://lobabinuladeri.medianewsonline.com/bernardo_guimares_o_seminarista.pdfIn PDF document text
    • https://cdn.sqhk.co/mejiwimuza/lagfUnC/seven_letter_words_starting_with_ea.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/QHkiaij/pukatako.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/1sMqjfJ/70_diy_pallet_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/pQGhegh/bevuwovalamak.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/gfghVuj/dolevunefawuzed.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/dunkin_donuts_iced_coffee_cream_no_sugar_calories.pdfIn PDF document text
    • http://watogoda.mypressonline.com/what_type_of_yarn_is_caron_simply_soft.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/41824786729.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/gg1iaEz/34892896072.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/confessions_of_a_mask_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/O1hfFgc/mufepokisonixaju.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/aa48e106-6f93-4be7-9368-7d1e71c393de/kijalujiwudidub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a31c714-4f27-4686-a287-ef67df0d524d/echo_srm_225_line_replacement_instructions.pdfIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_5aca443848884f92baa670786c3b611f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e981c73d-3e01-4ad6-9e94-6715b1280da7/lofipiporopadajamitikig.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/little_fires_everywhere_trailer_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928f389d-9ee6-435a-93a6-4a7d53727124/54129422530.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/bubimilofagigu.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/9952211965.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_49f59ddb93c942b3881aac29af16c855.pdf?index=trueIn PDF document text
    • https://233b4d2f-9c44-4004-b776-098ebc281e6f.filesusr.com/ugd/7f980c_fe35f7024a5e41b4a6bce56f700d0fc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e87487-6515-40bf-a905-5005f9d13b70/the_way_to_rainy_mountain_summary_shmoop.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/91443948100.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/bhai_behan_ka_pyar_shayari_image.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_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 4772 bytes
SHA-256: a8e519449f6feba5361b1664b4a18fb252a1d744e4bd58ead63eaf9f8eb513b1
font_01_sfnt_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 5156 bytes
SHA-256: 77ccf429f9ac4d9244611496e9c257103d312cb7a76278815af7b665eefda086
font_02_sfnt_off00010c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C44 11232 bytes
SHA-256: 6bc6530178780dbc143f2ae8b5094e0b1b899bf266ca69b896c7aabf1a1405f9