Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a11523fa6de88a…

MALICIOUS

PDF

80.2 KB Created: 2021-03-24 06:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 59dff56063e9ee3bc2e7618c329f3e44 SHA-1: 5763fdfb3ea0086314cc99bdcd160a59b7ce486a SHA-256: e5a11523fa6de88a9d6285cadef7c7468d282fa00c175fd51092b472c3ae86cc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to various disposable domains, likely used to host further malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://baarspo.ru/wix?keyword=trumpet+mouthpiece+sizes PDF link annotation
    • https://sizonijuza.weebly.com/uploads/1/3/4/5/134594560/lawejenobejipo.pdfIn PDF document text
    • https://pufoputinagof.weebly.com/uploads/1/3/4/2/134234879/91da590852fc13d.pdfIn PDF document text
    • https://wegebumerovoni.weebly.com/uploads/1/3/5/3/135387929/5434334.pdfIn PDF document text
    • http://zavudonalu.66ghz.com/jameg.pdfIn PDF document text
    • https://dururamud.weebly.com/uploads/1/3/4/8/134846475/23e6a6f5e7e.pdfIn PDF document text
    • https://cdn.sqhk.co/dawupana/cjcmbHJ/silvercloud_inn_portland.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/jhgicge/view_photos_samsung_smart_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/awAnprC/island_princess_royal_magic_quest.pdfIn PDF document text
    • http://gifozazupu.iblogger.org/55127747199.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/1jje4gc/classic_old_phone_ringtone_iphone.pdfIn PDF document text
    • https://gizazegixewaner.weebly.com/uploads/1/3/4/5/134596748/f9d7d453d0a4f.pdfIn PDF document text
    • https://jawufilarom.weebly.com/uploads/1/3/6/0/136054640/1209808.pdfIn PDF document text
    • https://mixojokujize.weebly.com/uploads/1/3/4/3/134387696/vuzesorufidegudu.pdfIn PDF document text
    • https://ludamezowi.weebly.com/uploads/1/3/4/1/134131800/nupagodemi.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/dbdjftI/music_with_lyrics_on_snapchat.pdfIn PDF document text
    • https://luzuredero.weebly.com/uploads/1/3/4/0/134016924/1273685.pdfIn PDF document text
    • https://xulomonixibeneg.weebly.com/uploads/1/3/1/4/131455416/e7440d4e062bb54.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://gogagenuju.rf.gd/how_to_turn_off_cateye_velo_9.pdfIn PDF document text
    • http://femasusatatovet.epizy.com/checkerboard_mesa_formation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1827bcb7-d805-4203-afea-ee58450c5cb3/fisher-price_sweet_surroundings_monkey_cradle_n_swing_manual.pdfIn PDF document text
    • http://fikumawaxawow.rf.gd/zegitufopaxezubude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea30347d-af74-4deb-ad8b-6cd7c27090f7/what_is_a_cultural_autobiography.pdfIn PDF document text
    • http://velewifepu.epizy.com/bagobo_tribe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35b083ee-544a-4698-a806-46b42127333f/meaning_of_marbury_v._madison.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_off0000f217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 4704 bytes
SHA-256: 9206bb3ea0742c68c404507b154993986793dfa68e3622d122be8c2d41a2d2ec
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 10316 bytes
SHA-256: 53080a5e94081f715a81f0acd567d41d423c66c42e1fc4e812ccce7fec4a62a7
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c