Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb055c29d5b09d5…

MALICIOUS

PDF

75.9 KB Created: 2021-05-15 21:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 38f2c4b394d383784a625187d3f57c8a SHA-1: bd5a605f794d2a80758248d3af5c388beebfa3dc SHA-256: bdb055c29d5b09d578f795e214b59cd099569f1faaf8837b6c6adea22e397566
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file that exhibits characteristics of a malicious redirector and link farm, with numerous embedded URLs pointing to potentially malicious or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the nature of the heuristics suggest this file is part of a phishing or spam campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=christmas+carol+book+summary In PDF document text
    • https://debeseroduk.weebly.com/uploads/1/3/4/4/134467522/dalububoboraxowabeve.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/davadofadivexewakudanthvas.pdfIn PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/85c5ef3.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/hz9POtl/zombs_battle_royale_crazy_games.pdfIn PDF document text
    • https://dufofumiwiz.weebly.com/uploads/1/3/5/3/135309849/punoverafunipen_setola_sobam_niwalirub.pdfIn PDF document text
    • http://tixshopclub.space/dna_extraction_from_onion_lab_answerssdkby.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/geZMifU/how_to_do_the_walking_dead_zombie_makeup.pdfIn PDF document text
    • http://gulebamabixaku.22web.org/beautiful_in_white_shane_filan_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/EEFcij9/fire_alarm_sound_very_loud.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/bkifruc/3038148891.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/bovise_xanugezox_gezagevino_nunuzeves.pdfIn PDF document text
    • http://ladyso.ru/fupunarazepugopulu8knch.pdfIn PDF document text
    • https://jikuvubavul.weebly.com/uploads/1/3/5/9/135964228/1317781.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/8ec3feff-1d4c-4391-aed8-37416ccaf912/are_infrared_heaters_economical_to_run.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f6fe294-f01c-4de8-8093-f133c2bd3fe9/93358234423.pdfIn PDF document text
    • http://guligovidafijew.rf.gd/blues_guitar_lessons_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03eff950-ac09-491f-8ff6-f941c9ea4e39/the_culture_map_erin_meyer_free.pdfIn PDF document text
    • http://nonulalomijowo.epizy.com/36539220435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8872235b-9d55-42c8-83b1-4bac13ef391c/dumapivujerosubevat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172f95c1-1500-41b3-ab85-95b623c66a80/tipo_de_beneficios_para_funcionarios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29c3e45b-1d74-4288-81ec-6d15b66fdf88/ncert_solutions_class_11_physics_chapter_7_study_rankers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88671892-5905-4be6-9c6e-6b33ec90e90a/snap_on_mt2500_scanner_for_sale.pdfIn PDF document text
    • http://duwujedop.rf.gd/does_friedrich_nietzsche_believe_in_god.pdfIn PDF document text
    • http://rukojipunuwupur.epizy.com/29596963803.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_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 5248 bytes
SHA-256: 84db086b5704fb3e68ea1789debaa35e1e1ec0579c07e2cae63386b784f3821c
font_01_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 10256 bytes
SHA-256: 8a5fc2d8b34cde7e36e5a378cb387da3acc4f5ebfe54fc7f3d57c0ed61669722

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