Malicious PDF — malware analysis report

Static analysis result for SHA-256 408f15d628a8c297…

MALICIOUS

PDF

78.4 KB Created: 2021-03-15 08:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: a3786a550bc9545f59aa4be662944825 SHA-1: 987930101e0ffd0e714c23277ffd3eee43fcc89f SHA-256: 408f15d628a8c2976a8b8ca1bad14d7be9f6fc90033fe0d61565c00a598d29ad
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a dropper or redirector to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://druttle.ru/award?keyword=analysis+of+algorithms+tutorialspoint+pdf PDF link annotation
    • http://mebovaduzi.mywebcommunity.org/absolute_essentials_of_islam.pdfIn PDF document text
    • https://cdn.sqhk.co/motuwezelu/hHIgfje/creating_a_family_budget_template.pdfIn PDF document text
    • https://cdn.sqhk.co/rugugojeba/ZgcHM9Q/rank_one_forms_fwisd.pdfIn PDF document text
    • http://idslim-italia.site/71377356637m5qil.pdfIn PDF document text
    • https://cdn.sqhk.co/volinafi/gejchcD/72746414900.pdfIn PDF document text
    • http://noxopadorilu.iblogger.org/2861760876.pdfIn PDF document text
    • http://keepmaxi.space/e_bildirge_kullanc_deitirme_formuf971v.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/74127931667.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/hgAFaif/bullet_hell_300_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jamolipa/diasjgf/videoder_hotstar_pc.pdfIn PDF document text
    • http://help-violation.com/85281683629y9vly.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/role_of_missionaries_in_colonization_of_africa.pdfIn PDF document text
    • http://anyita.space/29609828792q11iw.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/dujepav/36369486922.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/how_to_do_tarot_cards_for_beginners.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_1aeddc2bc6f14130ac6f1c2167413a4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/el_materialismo_histerico_xavier_velasco.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/customer_service_interview_question_and_answer.pdfIn PDF document text
    • http://zizokeb.rf.gd/the_sum_of_interior_angles_of_a_regular_polygon_is_720_degree_720720_degree.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/zutapofosuvulexaxesomusun.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_a58e74f8981b48afa021cc886105fa48.pdf?index=trueIn PDF document text
    • http://sajulugebimisu.myartsonline.com/71662536403.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/63109627996.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_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 5544 bytes
SHA-256: 586085d0f7df2bfcdef9802c7f513968c2f8f014bbb71b84bedfbadeeda44327
font_01_sfnt_off00010273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10273 12568 bytes
SHA-256: 3c40ceb0f2d244d78f3e8e8ba97f9d34abba055c91c45e9e7bdf38263e760509