Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea5e7bc80dc7a50…

MALICIOUS

PDF

79.6 KB Created: 2021-03-29 02:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6fe51e9e895ea09d7822d7e56e38f092 SHA-1: 5ba50619645a87231e1dfdf140dc9f847129d120 SHA-256: aea5e7bc80dc7a503163e0d48f314ab7008994655d4d94c85e001a2c4976c12d
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

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://nipisod.ru/wix?keyword=society+the+basics+13th+edition+chapter+1+pdf PDF link annotation
    • https://rarozevalir.weebly.com/uploads/1/3/1/4/131437937/jajevitut-ginezodexunufo-mekuxokop.pdfIn PDF document text
    • https://kujiguvasate.weebly.com/uploads/1/3/4/5/134584602/2d828.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/bhjwIhs/borne_arcade_dragon_ball_heroes.pdfIn PDF document text
    • https://wixapikolomuv.weebly.com/uploads/1/3/4/7/134746431/buzug.pdfIn PDF document text
    • https://cdn.sqhk.co/xixewebirike/idhDiDu/22323055360.pdfIn PDF document text
    • http://fesetinidu.iblogger.org/simulador_de_la_prueba_ser_bachiller_2020.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/libikipubo.pdfIn PDF document text
    • https://veminimuvaw.weebly.com/uploads/1/3/4/6/134630651/58b94fa85922.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/Rgeihia/builder_base_level_5_builder_hall.pdfIn PDF document text
    • https://xapidusexinixov.weebly.com/uploads/1/3/1/3/131382907/4018958.pdfIn PDF document text
    • https://mamonaxerif.weebly.com/uploads/1/3/5/3/135347384/jofupebawib_bomereninufaru_sezilowilivinir.pdfIn PDF document text
    • http://kakaxazirobolob.iblogger.org/cutaneous_larva_migrans.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/Yhhi5jf/the_angry_birds_movie_2_zeta_voice.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/VhcWKiZ/85539729563.pdfIn PDF document text
    • https://cdn.sqhk.co/soribivevi/hijl34J/51405948500.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://s3.amazonaws.com/kudowo/golekoromonitivo.pdfIn PDF document text
    • http://josewovegufi.rf.gd/zolujitegop.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/62508584032.pdfIn PDF document text
    • http://tojozolatenizum.epizy.com/51937064221.pdfIn PDF document text
    • http://wukezize.rf.gd/performance_anxiety_at_work_symptoms.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 5560 bytes
SHA-256: 20668e6a3cd36c83e4ac3e1432550a3196bff927c0d4028b8a84ed448a568fc8
font_01_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 10648 bytes
SHA-256: 2fac5f25940ee98b2a33355eb510288677c23fe7dfbbbcf6e5aa4ccb89dbc529
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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