Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1177945b2b56b0f…

MALICIOUS

PDF

87.8 KB Created: 2021-04-06 09:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8058883de5fd759f7f9b98f9dfe22e36 SHA-1: deca7b321d3579d3dcab99b8b127800345374ee8 SHA-256: c1177945b2b56b0f3bbac4aeb5ca23ba54d704379d1ba40c48025ab95ee1fe63
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to an 'authorization letter format bangla'. The presence of external URIs, particularly 'https://ponafet.ru/123?utm_term=authorization+letter+format+bangla', indicates a likely attempt to redirect the user to a malicious site for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=authorization+letter+format+bangla PDF link annotation
    • https://cdn.sqhk.co/susojareb/Z2idjfJ/639823202.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/iYMEnML/buddypress_member_profile_page_template.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/wusuzafudu.pdfIn PDF document text
    • http://relax35.ru/fedalovalexibuxapeobf.pdfIn PDF document text
    • http://shoop-fn.ru/sunless_citadel_fortress_level_mapps6t0.pdfIn PDF document text
    • http://penageli.getenjoyment.net/tipo_de_comunicacin_celular_que_promueve_los_anticonceptivos_orales.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/management_science_and_engineering_degree_undergraduate.pdfIn PDF document text
    • http://samo-katim.ru/305159594741tx4n.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/4icgfPw/werewolf_the_apocalypse_earthblood_release_date.pdfIn PDF document text
    • http://musomojil.mywebcommunity.org/bielle_manivelle.pdfIn PDF document text
    • http://interbankdigital.com/53520081941qx12i.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/alkanes_iit_jee_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/rezeribevi/vVhgAji/what_is_dinkoism.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/0cee9e86-b77a-4b06-aca8-8d4ccf3fc051/ubiquiti_nanostation_loco_m2_bridge_configuration.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/sample_iso_27001_internal_audit_report.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/fexux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a2ab0a-5797-4f44-974f-530beae3f986/liwimazo.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/dortmund_vs_barcelona_highlight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80d6bd4e-908c-4f69-a3f5-18704f280aeb/wezuxufopu.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/dexikilaroxivikinoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb0f78bd-f545-4a39-ac07-5d0c78075f37/zorivifapaxodojokaxat.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/bipofakelekusorapubotuxok.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_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 5180 bytes
SHA-256: f67c133d037f3c858631522c2221efaac462ff754a7349d171309e1f32663faa
font_01_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 10876 bytes
SHA-256: e63705601f202da447c3a37f6010219ea2e5e07213e707758f8b8903382951dc

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