Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53428b3f2983c2b…

MALICIOUS

PDF

80.9 KB Created: 2021-03-30 15:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 82865be4948b77b584a906d28f37fab3 SHA-1: 5141374fbff63b8b94cfcf9b7ba7382360a5aa76 SHA-256: e53428b3f2983c2b24a68fd48945dc20327b17df61c8e3c83799626d98aebec9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://xajibur.ru/award?keyword=antenatal+adalah+pdf PDF link annotation
    • https://cdn.sqhk.co/noxawuge/cZtifhi/partial_seizures_treatment_guidelines.pdfIn PDF document text
    • https://wosiwimobej.weebly.com/uploads/1/3/1/1/131164223/fagujanosu.pdfIn PDF document text
    • https://kekuzisalan.weebly.com/uploads/1/3/0/8/130813403/be2b097a4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458631/normal_60494b80084d3.pdfIn PDF document text
    • https://juvifopabolosat.weebly.com/uploads/1/3/5/3/135313118/gobaginepi-pazujemudonelax-pinasozekexefep-palabubitinos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473322/normal_60076a7045d2a.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/hgOhdAW/17096396024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fdecadc90f17.pdfIn PDF document text
    • https://texejuzaw.weebly.com/uploads/1/3/0/7/130775796/5c7a5416f87.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuvimi/cTkjjgc/mireroxamabavojoteramof.pdfIn PDF document text
    • https://cdn.sqhk.co/wojeberupe/hm9ijjd/sobewudonodozodew.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/roduwipipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_6022a9521c6ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502436/normal_603e879e9bf3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446260/normal_60008ce40100b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447096/normal_605452c1e567f.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/2bfeddd7-bbcb-467d-983f-6b70c295b8e2/vujiwadepinubibu.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/ayudha_pooja_telugu_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e311d44-f734-4098-8754-a8f6428d16d7/sta-rite_e01_error_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/689cf695-59cf-45c1-85b4-bd708bc081bb/6849997137.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/bravissimo_transformado_tocomfree_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9538b85b-ef7c-4b9a-8aff-3662886ab929/bapowuxerawovimamojipani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86457fe7-6533-4f97-a09d-11b50f9b6b1e/calculo_de_integrales_indefinidas_directas.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/voxonumojinozavodives.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/auto_signal_refresher_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/fannie_mae_announces_servicing_guide_updates.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_off0000ffd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 4844 bytes
SHA-256: aceb2d0d7945eee89b69fc89949443c35b92dc5a1433106195e4778f8b442218
font_01_sfnt_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 11364 bytes
SHA-256: 880d58d30809ce68b2aa83b44cf93fdc7e047447da4c7fe6800e51e1376f0c48