Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26f09963421f257…

MALICIOUS

PDF

72.8 KB Created: 2021-03-05 00:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 264aeca0f32998946cef4c5f28479495 SHA-1: dfea94c6d088d7c344dce8c5bc7342b614f69d33 SHA-256: c26f09963421f257e2cfe88526b57a255ad38341a00fa5451208eb7a013717fe
66 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a high-confidence heuristic identifying it as a link farm hosted on disposable domains. The primary malicious URL identified is 'https://leonvi.ru/award?keyword=what+is+the+uncoiled+stringy+dna+called'. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content, aligning with a phishing or scam lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://leonvi.ru/award?keyword=what+is+the+uncoiled+stringy+dna+called PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417830/normal_602d958136989.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/hidx3gj/nizepafexopotumesile.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/hdr9chf/mokurozokiwatuwetiziko.pdfIn PDF document text
    • https://cdn.sqhk.co/karopepagu/fheEidN/chanel_runway_egypt.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/c9jgmgd/pse_archery_nighthawk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489595/normal_5ff22b729d241.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/ie4KI6l/flight_simulator_2020_air_traffic_control.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_6013195713453.pdfIn PDF document text
    • https://cdn.sqhk.co/podadoxafa/hyhjhhX/votiwelabal.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
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_41e56daaf1324611b1c90cbd28059b64.pdf?index=trueIn PDF document text
    • http://mowekejerejo.rf.gd/happy_new_year_sheet_piano.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_139bc003d1884180a4b40809cf30027b.pdf?index=trueIn PDF document text
    • https://03dfb0eb-7fe6-4188-ad87-ea2b88df7b19.filesusr.com/ugd/f967ac_0c2e9f84198e45e795c50ef5d5b4040c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sewamos/weworuzaroliromaj.pdfIn PDF document text
    • https://s3.amazonaws.com/mavixu/curriculum_guide_cookery_grade_9.pdfIn PDF document text
    • http://wowulikuvej.rf.gd/75421306422.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/formation_animaux_en_ligne.pdfIn PDF document text
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_f43847325ac34d60ac8b4b8362c1674a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 5200 bytes
SHA-256: 0a31363c593886599b00ae7256ab4e8fca8c6158e2bb8103338d0cd7e18fa4f8
font_01_sfnt_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 9640 bytes
SHA-256: 1151dea6c80ddaab801b36993c78e8967705e6386a4abb1a8abfb21190d60e56
font_02_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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