Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd7f27119f8a828…

MALICIOUS

PDF

67.8 KB Created: 2021-04-07 02:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 53ca3d56eb8b786075d66a503ba8f5ba SHA-1: 6ec380d75fb9c072622165ae7b42b2afa3a77008 SHA-256: efd7f27119f8a828bc07e435708ed1da33631391cdd8a953c38dba6f524ab4e7
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using small PDFs as link farms, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/award?keyword=aprendizajes+clave+para+la+educaci%25C3%25B3n+integral+preescolar+pdf PDF link annotation
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/6784555.pdfIn PDF document text
    • http://zivemigidefis.mypressonline.com/international_accounting_standard_27.pdfIn PDF document text
    • http://pubgucbayim.com/batuwogulojagz0gm.pdfIn PDF document text
    • http://thiswaytovogue.com/how_to_read_a_poem_burton_raffel1p35g.pdfIn PDF document text
    • https://cdn.sqhk.co/zipaduteki/fhhheji/veleje.pdfIn PDF document text
    • https://jotowaviroretog.weebly.com/uploads/1/3/4/6/134604658/xivixax.pdfIn PDF document text
    • http://towesijep.iblogger.org/hs_1st_year_biology_book.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/muwefizulisif-xuximukuwurijog-zosatonufod-resudi.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/ifjc3ha/pico_iyer_quotes.pdfIn PDF document text
    • http://tertov.xyz/comfort_sentry_2_2_programmable_thermostat_manuali1bsy.pdfIn PDF document text
    • http://chtotakoeverti.biz/six_easy_pieces_essentials_of_physics_by_its_most_brilliant_teacher28f6z.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/hjjcjcH/tesla_tower_clash_royale.pdfIn PDF document text
    • http://wejnpowk.space/nenifejedbpii.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/cracking_the_code.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_6f791288042646bfa89865304ed3513c.pdf?index=trueIn PDF document text
    • http://jerananixakuzeb.epizy.com/chuyn_t_sang_hnh_nh_online.pdfIn PDF document text
    • https://89d9876f-4e47-4433-ab5b-8da47ae3ae5c.filesusr.com/ugd/37c326_45bfac17fe9c45ac9a0567d4e10c663d.pdf?index=trueIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_12735f6434c240b9a1cef26e33f8c74f.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_2918b0d52a3849e6b7b1d299d38c3a38.pdf?index=trueIn 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_off0000c8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AE 5632 bytes
SHA-256: 47a29293abcc30c3e8ea004c07da907a48d794828b5578790295b7cb3b36a958
font_01_sfnt_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 10732 bytes
SHA-256: 1f7aa27565efa93a2615dad3db260366dfbcc6457c3df68535dffe1a9cf19e58

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