Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9511043a17004c…

MALICIOUS

PDF

106.1 KB Created: 2021-03-28 04:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e896eb1464ed007285c2122c40adc17 SHA-1: 5996b1d29a56e7b60ee73c06b0f6e7e3a57753ee SHA-256: 5f9511043a17004cb1dc2692d83a619ee3072e8b9d2246a15688d88db09fac5e
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'natural antibiotics', likely to trick users into visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/award?keyword=101+antibioticos+naturales+pdf
    • http://iuts.space/aviation_weather_bookvs4qw.pdf
    • http://health-top.ru/algebra_2_common_core_test_1_answersluwok.pdf
    • https://cdn-cms.f-static.net/uploads/4408871/normal_601481de79d02.pdf
    • http://romeoplanet.club/whirlpool_gold_double_oven_control_panellf8c0.pdf
    • http://myimperfectmomlife.com/oracle_19c_vsession9ufqx.pdf
    • https://cdn.sqhk.co/tezikegoj/etsq7jb/aquapark_slide_io_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4414166/normal_60049463ec783.pdf
    • http://twobigs.space/chess_puzzles_mate_in_2_for_beginnerslhyo6.pdf
    • https://cdn.sqhk.co/rovonoset/hAQhbif/716513713.pdf
    • http://rutinesuzufogat.mypressonline.com/tujewej.pdf
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5fcaa8396ee02.pdf
    • https://cdn.sqhk.co/zozimevoket/n3iahe9/face_mask_cloth_amazon_prime.pdf
    • https://cdn-cms.f-static.net/uploads/4446275/normal_603185626e194.pdf
    • http://bobixuposu.22web.org/damber_sheet_near_me.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://noroved.myartsonline.com/jozujufu.pdf
    • http://sabenimuzu.rf.gd/lucida_calligraphy_font_bold_free.pdf
    • http://rimaxuzekinixib.epizy.com/inorganic_chemistry_book_by_huheey.pdf
    • http://tubagawidi.epizy.com/actonel_combi_d_information.pdf
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_90c7ed8207824f4e9133c32501c49f42.pdf?index=true
    • http://dasujisetojasel.epizy.com/game_buzzer_app_for_android_and_iphone.pdf
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_b04f7a3721e9421387bae0da7e0a511e.pdf?index=true
    • http://jisunopesaluzi.atwebpages.com/12839147471.pdf
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_d78ca1fa8b1a4bbeba74cf6c7c155bc3.pdf?index=true
    • 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_off00015da9.bin
6616559df2a8093d7753753a0d29e7dcc566a1bfbefd5aab9a4efd73848b8d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA9 5388 bytes
font_01_sfnt_off00016fff.bin
7612c2f1a47a25f505e55bd671553f162bb74b4d75626125cc2ff95ee88e3ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16FFF 12936 bytes

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