Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fce10294a8c4548…

MALICIOUS

PDF

76.3 KB Created: 2021-03-29 00:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0dbc2c84b434e0bb05976b5f0c64a193 SHA-1: abf64c702496c46c901628e8abdc3a12695c639d SHA-256: 3fce10294a8c4548dd780be010a92cf239296ab49c2d0163c5c105f3959dc253
126 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 SEO spam operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious content, possibly via embedded JavaScript or other PDF exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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://vilenefex.ru/123?utm_term=complacency+in+recovery+worksheets PDF link annotation
    • https://gujinaberukigav.weebly.com/uploads/1/3/1/8/131856979/0a15467176fe6a9.pdfIn PDF document text
    • https://jezemubo.weebly.com/uploads/1/3/6/0/136094449/7411777.pdfIn PDF document text
    • http://naguvogegexaze.22web.org/how_to_calculate_working_capital_on_balance_sheet.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/domanomadibuxebul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410965/normal_6001be6108363.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369152/normal_5fe11d08e7a7f.pdfIn PDF document text
    • https://dawipufa.weebly.com/uploads/1/3/3/9/133986453/3119932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367303/normal_601726dd5b99f.pdfIn PDF document text
    • https://zubotovilep.weebly.com/uploads/1/3/4/5/134581484/e2ff185d.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/bhhhdia/play_age_of_empires_2_steam_mac.pdfIn PDF document text
    • https://femoleperatofev.weebly.com/uploads/1/3/4/7/134752505/dejezeb.pdfIn PDF document text
    • https://jitipukojid.weebly.com/uploads/1/3/4/7/134707402/fifunatepofodi.pdfIn PDF document text
    • https://vesalitekaso.weebly.com/uploads/1/3/4/3/134314643/dozawet-gimun-goxadapuwefarob-pepanifigi.pdfIn PDF document text
    • https://lefazevi.weebly.com/uploads/1/3/0/8/130873710/3252165.pdfIn PDF document text
    • https://movojedafep.weebly.com/uploads/1/3/0/8/130814843/4cae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_6012e0ca740cc.pdfIn PDF document text
    • https://cdn.sqhk.co/lasetipulos/fDaheq1/pottery_wheel_bats_use.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jefokilekik.rf.gd/55740626474.pdfIn PDF document text
    • http://jegelafaxorew.rf.gd/65121384052.pdfIn PDF document text
    • http://zezazemana.epizy.com/alcatel_lucent_8038_manual_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/financial_times_fdi_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/businessman_naa_songs_free.pdfIn PDF document text
    • http://tenapaja.rf.gd/base64_encode_not_working_in_ie.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/free_after_effects_slideshow_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/mississippi_driving_learner_permit_rules_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/calendario_de_vacinas_2019.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_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 5396 bytes
SHA-256: 6812ef2e0fee73b252494d777c3e411ed7eb44da527b8873a6732b3bf3af5934
font_01_sfnt_off00010227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10227 9744 bytes
SHA-256: d10c6a582350a19c3d643d933fc531dbd2f1133222e69f73575dd3c0d5cb9b95