Malicious PDF — malware analysis report

Static analysis result for SHA-256 561c156efd1dd581…

MALICIOUS

PDF

76.9 KB Created: 2021-03-06 12:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 00f952b40f91301c3368376caec7dbbd SHA-1: 26ecdaf199717119b71b247d204fedd16e6e9d5a SHA-256: 561c156efd1dd581784b4aa59a5c6a622834798e3d762681c6d495c8fae1e737
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/123?utm_term=easy+classic+rock+songs+guitar+chords PDF link annotation
    • http://repair-planshetov.ru/branches_of_science_and_their_meaning4r6gv.pdfIn PDF document text
    • http://beliyden.xyz/leo_tome_2_ekladataltc84.pdfIn PDF document text
    • http://fruittea.space/preparazione_al_celi_3_b2_livello_intermedio25n96.pdfIn PDF document text
    • http://gnoogle.site/import_chrome_bookmarks_to_brave_android9kipb.pdfIn PDF document text
    • http://mainsale.info/vevifutugetisenebapotainfn.pdfIn PDF document text
    • http://peteferix.mypressonline.com/lg_waveforce_washer_filter.pdfIn PDF document text
    • http://manenumo.iblogger.org/reigns_her_majesty_game_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/hcSSqgj/tangled_the_series_season_4_petition.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/jf8tlhe/kusinibovit.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/bizadozakuwazolimegi.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://uploads.strikinglycdn.com/files/643799ee-baa3-41c6-b00d-5bf47e34fcf3/75897610964.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/asus_rt-n66u_firewall_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99fe4bff-abc2-4011-8955-2bc8deb99d6d/82155116189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/809b4ccc-8d41-4a9e-9b55-f41b618decf7/arrowood_golf_course_membership.pdfIn PDF document text
    • http://gewofudi.rf.gd/gudofaruku.pdfIn PDF document text
    • http://wukosow.epizy.com/que_es_un_cianuro_wad.pdfIn PDF document text
    • http://rejeremonuwiz.rf.gd/addition_equation_and_conclusion_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3675cc0d-b05a-4fc9-a406-5a881b952e44/how_to_install_fallout_4_script_extender_with_vortex.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/minezobupovob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b01b6b94-b04e-4d80-85cc-20a4acdb7f8c/67850742701.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/proform_cardio_hiit_programs.pdfIn PDF document text
    • http://nupopejif.epizy.com/free_job_resignation_letter_template.pdfIn PDF document text
    • http://wipadafefuxasi.onlinewebshop.net/craftsman_wet_dry_vac_hose_adapter.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
stream_003_off0000f314.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF314 11212 bytes
SHA-256: e46fa2112e7e92ce45bd8eed855cf25567b0f5a84e1448fd6e3afe7d0951c7cb
font_00_sfnt_off0000e1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D9 5088 bytes
SHA-256: fec09ef45266a868be56ed045d68b1a53c12d2e3e70cd21fe9f6f71542d9e65d
font_02_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333