Malicious PDF — malware analysis report

Static analysis result for SHA-256 1110d1ef18987f93…

MALICIOUS

PDF

81.6 KB Created: 2021-05-01 15:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b6e48f565d8f129e0d93ec9602148f67 SHA-1: 71535cd4cd40221db03901f134a5813d77bbed0b SHA-256: 1110d1ef18987f938633a0438514ef0cd5ad3791f0584b1bb0338e5aab6ebf35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9994

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://botokaw.ru/strik?utm_term=what+are+the+most+significant+qualities+of+byzantine+art PDF link annotation
    • http://savadaqwe.space/pride_and_prejudice_volume_1_chapter_13_summarykyuya.pdfIn PDF document text
    • http://thiswaytovogue.com/mega_construx_game_of_thrones_battle_beyond_the_wallbzxzk.pdfIn PDF document text
    • https://cdn.sqhk.co/vorebilifi/hHTVgvi/19012547723.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/cWhahh2/26623001628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_600facc94be54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_602d6a2c1f84f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418001/normal_5fc95d1c8385c.pdfIn PDF document text
    • https://cdn.sqhk.co/nikapeke/cqesOib/falegamom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_60696c3e644a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5ffdb711cd31e.pdfIn PDF document text
    • https://cdn.sqhk.co/zonakagud/iTjjpij/snapper_fishing_long_island_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366620/normal_5fec98569ba2b.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/CC5hjhc/video_editor_fast_slow_reverse_boomerang.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_6045cbc866edf.pdfIn PDF document text
    • http://nout-prokat.website/korul8axgn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zexaxekiki.atwebpages.com/koraxezetakadodowudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb3ffc6-ec76-4d1d-8467-9e33cc8312a3/renenejamigufona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4a0290-7571-4e1c-a1df-f7d45bd2413c/dewalt_cordless_drill_without_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88205b58-fef0-416c-81e4-5d188b4fd2db/how_to_sell_salesperson.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/english_phonetics_and_phonology_peter_roach_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee4571fa-a621-43ca-9c83-169b1fa82238/69864995850.pdfIn PDF document text
    • http://dapibudajemuk.atwebpages.com/class_11_cbse_biology_book_download.pdfIn PDF document text
    • http://kopolug.myartsonline.com/adobe_acrobat_reader_for_pc_download.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_off0001017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017A 5724 bytes
SHA-256: b42580c9206f0aa03518fa498eb75def5f89c16604660480fd4e45b2ad9b53e4
font_01_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 10704 bytes
SHA-256: 55c6d9ed24878040ae93312c42b3164d77974ac6b3f634c148eb07d0004e86c6