Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d022fd823cfc251…

MALICIOUS

PDF

81.1 KB Created: 2021-03-21 01:49:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8acc09e7470452b8b5c8e4e22238b06c SHA-1: d2121bfbb99eb0e21a8a53efc99720e38ff9480f SHA-256: 5d022fd823cfc2516693cb640cea74f513884a72ab2ef28dc711c312bd82cfc7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=identifying+and+non+identifying+adjective+clauses+exercises+pdf PDF link annotation
    • https://jutifakakunule.weebly.com/uploads/1/3/5/9/135985430/2671803.pdfIn PDF document text
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/tekemir_karemagorajipi.pdfIn PDF document text
    • https://poxigupi.weebly.com/uploads/1/3/1/3/131398264/3106364.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/widiku/7571769236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da5bc378-4136-42a7-bc5c-b584349d0538/adele_someone_like_you_piano_sheet_music_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/171bfe9a-de92-4b07-880b-3e576fb1e7cf/wiwotalipipadokir.pdfIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_68818a5629ed4bf3bf4f6583da218f5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b03f3e-1052-4f44-b97c-0ef34404fcf2/irobot_roomba_980_price_compare.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/88821740957.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8e87ba9-97b5-49e7-823c-86833ff9671e/dunkin_donuts_bag_coffee_coupon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51a73cf-85b1-4e56-ae3e-f11010fd8af8/2879829782.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/batman_joker_hd_wallpaper_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf4e0e1-5ab3-48c7-864b-080d178d8c37/xunovuzuruwikopole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5ebe7d-0294-4d48-b6bf-ac463e1a03f1/31302038390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6860c9c0-3980-4cc9-b8cb-ca9cc6fc19b6/verbos_en_ingles_y_espaol_en_pasado_presente_y_futuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/016715d4-138f-4d20-9b85-30dffaa7c0d5/how_to_acer_iconia_tablet.pdfIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_d8ca777e548c4e12804433763279e30e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b24e7d2-3add-4ba5-b6aa-263c8f9e66c4/xaraneje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73a0f067-3e63-475a-8c81-b394bc3db073/the_big_short_real_characters_net_worth.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_off0000fc82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 5564 bytes
SHA-256: e8e24ab6a967746e057538df03a3ce3c880f6b8ae9f5420bc4cd1d019fe6c046
font_01_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 11724 bytes
SHA-256: 94ed0d900470022abc0c0af9484c141dd812e9b70952fe5f09dde712b8828128

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