Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3661a83895255d…

MALICIOUS

PDF

132.7 KB Created: 2021-04-05 11:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9c1ece00163c2ca74dbea992bb35436 SHA-1: b4c1de70d65cbff47134bbc93509483b07095448 SHA-256: ed3661a83895255d0f0fc603ada02669d5926246640f09b16a74a5adf7c161d5
134 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous embedded URLs, many hosted on disposable domains, and exhibits characteristics of a link farm designed to redirect users. The presence of urgency lures further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/award?keyword=alphago+master+pdf PDF link annotation
    • https://cdn.sqhk.co/nikamegamu/mYFjkAE/20976083269.pdfIn PDF document text
    • http://xviiivbgz.com/add_a_font_to_wix1okhv.pdfIn PDF document text
    • http://reduslim-italy.site/gogudumavokobu81x6t.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/IcjjZig/jiwokuvemosat.pdfIn PDF document text
    • http://totalcreditcheck.info/mejor_curso_de_ingles_online_gratis_20197u1zr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406820/normal_6066b8e8345d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478950/normal_6046933b0429e.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/ggjfajg/strikers_1945_2_ps1.pdfIn PDF document text
    • http://itsamorem.com/how_much_does_the_kakarot_dlc_costpsej2.pdfIn PDF document text
    • http://susurrus.space/47264020722x9zk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kelajerifa.epizy.com/intermediate_microeconomics_varian_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9598e02-618d-444c-810d-cfeb2e668f52/91322390476.pdfIn PDF document text
    • http://fadowudi.rf.gd/pre_marriage_counseling_certificate_template_free.pdfIn PDF document text
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_6b7d704e6c9f4bbda9700b8c9025c182.pdf?index=trueIn PDF document text
    • http://futivel.epizy.com/fairy_tail_anime_season_10_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6dd405a-d6b4-4b8f-bb60-728de62ba93a/fuvigujoxev.pdfIn PDF document text
    • https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_a69d2dc95cd14d86908e24f3be25a49b.pdf?index=trueIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_8ff696759b194298a5c5e9621a98ac08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c2c646-8d84-42cf-838f-d948efd0f274/54121072677.pdfIn PDF document text
    • http://loxugosatutibiv.epizy.com/25129210281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8a80c3-90cc-4768-abc0-03ca58ac29d3/el_nombre_de_la_rosa_pelicula_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1e9e99-d9bc-48b9-b798-83cb19e7952b/the_natural_rate_of_unemployment_consists_of_only_quizlet.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_off00014912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14912 41584 bytes
SHA-256: b6fc66627dc899411e70f6a6a83b5e3bca4dbb36d3261d37d9801e38efc0a502
font_01_sfnt_off0001ca31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA31 5444 bytes
SHA-256: a48b47334f8592287a91ffd83e8bcfc8bbdf5471c0a933f666ddea5e50afa46f
font_02_sfnt_off0001dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC8A 12204 bytes
SHA-256: e34e3ecc053baa0bd7a956ad5c87334e63e99ee2e0f3c5a99de9a256378920f6