Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73aeee9e44d11b2…

MALICIOUS

PDF

83.2 KB Created: 2021-03-10 10:40:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e448774b4e81f2a82048e02b38f71dbd SHA-1: 41ee2147b8d05580dc3ed38af488888e89ae4a36 SHA-256: d73aeee9e44d11b2983f8af1d80536da3f7e4f715339943975a11cd5cbb73970
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary focus on 'https://fokemale.ru/wix?keyword=chapter+7+statistics+review'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, suggests a lure related to statistics, which is then used to redirect to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/wix?keyword=chapter+7+statistics+review PDF link annotation
    • http://lelekelosutov.getenjoyment.net/full_metal_jacket_gun_prayer.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/gazepuzofukafer.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/bcjf9xH/tokaido_gi_review.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/Mgcic0m/24296458979.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/81064711647.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/tidupefatofuzekowar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_601c9551385aa.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/ig2ReQk/lugenoroxobasuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fe63975a2934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365635/normal_5fe0abb6be826.pdfIn PDF document text
    • https://cdn.sqhk.co/fixakozumad/eSZfyhf/49906505249.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/at8sghM/pesajenapekosoxixejumuku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/01aac22c-3008-4802-93ca-9f25e29677e4/attack_on_titan_season_1_-_official_opening_song.pdfIn PDF document text
    • http://revudipepofaten.myartsonline.com/22062335531.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_1f0b36dd27e247dc8701d59a30ae8f1c.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_a5e0a2a956bd46a0b44e939a966a0365.pdf?index=trueIn PDF document text
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_72d09e30e1bc4649ba4602938ff98b6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eac284c-b409-4f50-b9d7-0fef83188401/gebizagikitofu.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_b04860b05584488a9c942a0dd81ab0cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/001070bf-3100-4ed8-8e44-4af94beeff59/hindi_heart_touching_love_story_video_song_download.pdfIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_5229d61668f3435ab6785eada9878ed5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d602c0f8-2716-4908-a4d6-6b2e21057f80/how_to_write_a_proof_for_congruent_triangles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a407ddb9-85ba-4135-b9d0-10498c5aff6f/national_grandparents_day_song_lyrics.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_5048630595524ba3a0cf52003b68b188.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_6967ddfe93494cc1a0e84abcda122f13.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_c3e73942d4a2498e8c9f3ff32342526b.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E2 5128 bytes
SHA-256: f74b816eca4f138be033430cdf31063b354126d472e869fb11761322503192e6
font_01_sfnt_off00011a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A63 10840 bytes
SHA-256: 6a2ca7daee584d6deb478a3ef213f94d3c6a4b97bc1ce573a3e0c56303f09cfe

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