Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7982ef1fb1360c8…

MALICIOUS

PDF

115.0 KB Created: 2021-03-15 16:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae1ca0c28c778b33093f54807e7bc017 SHA-1: e48efac9e88c4c27989ceb8a8d9d0893f40e1174 SHA-256: a7982ef1fb1360c85d17ffcc2ecd8059b4c0cecfc0520410e9203c149af16929
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable hosting and potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/award?keyword=area+of+regular+polygon+pdf
    • https://cdn-cms.f-static.net/uploads/4415526/normal_6015aaa36524f.pdf
    • https://lopekemin.weebly.com/uploads/1/3/4/6/134628767/vomidurapovewom.pdf
    • https://jodowofimen.weebly.com/uploads/1/3/5/3/135330599/2183972.pdf
    • https://cdn-cms.f-static.net/uploads/4379601/normal_604067165f3a8.pdf
    • http://kakafeg.scienceontheweb.net/neluviwelugokejuk.pdf
    • http://delinapod.mypressonline.com/47927956935.pdf
    • http://bijepitujutix.sportsontheweb.net/how_to_open_lg_washing_machine_door_mid_cycle.pdf
    • https://cdn-cms.f-static.net/uploads/4450719/normal_60110b2db6faa.pdf
    • http://kejumazinanu.mywebcommunity.org/how_to_know_if_it_is_a_pimple_or_herpes.pdf
    • https://fatatovol.weebly.com/uploads/1/3/4/7/134707957/vamogomotitizofij.pdf
    • https://cdn-cms.f-static.net/uploads/4499329/normal_602ee3b0bad4e.pdf
    • http://robugipunebib.mygamesonline.org/57664481549.pdf
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/menoronesis-zepip-lixaxozaguw-noveredame.pdf
    • http://lajodibibodi.getenjoyment.net/revexeku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vekemelegewimo.atwebpages.com/define_organisational_culture.pdf
    • http://wufagezigedo.onlinewebshop.net/22414239214.pdf
    • https://s3.amazonaws.com/bomifabipi/47337912545.pdf
    • http://tefetuzuzip.myartsonline.com/ski_doo_service_manual_2016.pdf
    • http://toxifiv.myartsonline.com/global_blockchain_benchmarking_study.pdf
    • http://lebusepuwiri.atwebpages.com/ejercicios_adverbios_de_frecuencia_en_ingles_1_eso.pdf
    • https://s3.amazonaws.com/jixeremipet/css_grid_template_columns_not_working.pdf
    • http://resilasijajatil.myartsonline.com/defiant_led_flood_light_home_depot.pdf
    • https://s3.amazonaws.com/votubukaxogilix/printable_christmas_carol_lyrics.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001680d.bin
2745f3d0a09feff8df572a3563a2451503553d0ba3290b1b077b5fcf00949a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1680D 5124 bytes
font_01_sfnt_off00017995.bin
f2e08f24ea05c21cce294b7eb5b8d1df2987712b3db5982fee5ea665ac8b87b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17995 13432 bytes
font_02_sfnt_off0001a6b9.bin
c4364cbacc90280b8e8a4b47b6497d87c23718e069842a4ce7bf93bc4e424e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B9 16280 bytes

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