Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50ba1e97869d3c3…

MALICIOUS

PDF

79.3 KB Created: 2021-04-04 23:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5335c1b869f962b29dfdd430877adb8d SHA-1: 284689747080f205920c79ca9f1c817ca3c235bd SHA-256: c50ba1e97869d3c3816f7bc9230d0f57aa23d74b4eb04a9803110432e588f249
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier also strongly indicate maliciousness. The document body's text, 'Respuesta libro de geografia 5 grado pagina 51 contestado', is a lure to disguise the malicious intent of hosting numerous external links.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=respuesta+libro+de+geografia+5+grado+pagina+51+contestado
    • https://cdn.sqhk.co/loganidob/jY6hg24/paximelugukeluda.pdf
    • https://cdn-cms.f-static.net/uploads/4386839/normal_602c67f1e2165.pdf
    • https://cdn-cms.f-static.net/uploads/4415518/normal_605be07839982.pdf
    • https://cdn.sqhk.co/rivogigaweb/j1TgdIu/light_me_up_lyrics_luke_bryan.pdf
    • https://cdn-cms.f-static.net/uploads/4386606/normal_60656d10d48be.pdf
    • http://umniashka.ru/foscarnet_administration_guidelines4yewh.pdf
    • https://cdn.sqhk.co/najafizox/80jegcB/70600898231.pdf
    • https://cdn-cms.f-static.net/uploads/4408598/normal_5fd84958edfda.pdf
    • https://cdn-cms.f-static.net/uploads/4495694/normal_6047aad966514.pdf
    • http://raffle.website/rock_hero_2_mod_apk_downloady0u0r.pdf
    • http://nebo-baikala.ru/7008625380y1mx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_977a92824d6a448d8b0f6e7eb2e01fe2.pdf?index=true
    • https://s3.amazonaws.com/xoferuzu/que_significan_las_letanias_lauretanas.pdf
    • https://s3.amazonaws.com/jotizifime/lezulotenazuxipimetipiz.pdf
    • https://s3.amazonaws.com/lanorolowu/emulator_emulator_error_android_sdk_root_is_undefined.pdf
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_6ab4b59c3b7244d9aacdf672aa891ef1.pdf?index=true
    • https://s3.amazonaws.com/fowikorejodi/lowrance_elite_4x_ice_transducer.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/27504124349.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f022.bin
84a11af833d07a6e865ec553259ed657bc6190c6690173b6924f052a352fb2a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 5648 bytes
font_01_sfnt_off00010371.bin
e0e9084592200a4326114c34b07e42cc8e11698c87a90517d70074bafeb4b06e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 13192 bytes

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