Malicious PDF — malware analysis report

Static analysis result for SHA-256 985f9291c302d6d7…

MALICIOUS

PDF

76.5 KB Created: 2021-04-03 23:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a718e71eaa240e2e58c10e4de1e509d SHA-1: 27d592c95faf743b4d688177861d0b927e2f4421 SHA-256: 985f9291c302d6d7c0c9cb65b53be758190d197a3eb21773b7735e39120dc04f
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains an embedded URI pointing to a suspicious domain, likely intended to host malicious content or redirect the user. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://jumiwimov.ru/wix?keyword=pattern+symbols+worksheet+answers
    • http://kejadejaw.iblogger.org/bematech_lr2020e.pdf
    • http://megoribituvu.iblogger.org/tusasise.pdf
    • https://cdn.sqhk.co/kofuvufexo/hbr1nDN/probability_density_function_questions_and_answers.pdf
    • https://cdn.sqhk.co/wozepefiga/7hi8P0s/good_nun_puns.pdf
    • http://metryck.info/75166780819jd87u.pdf
    • http://fuxanujibiz.mygamesonline.org/epidemiologia_clinica_laura_moreno_altamirano.pdf
    • http://vubitim.sportsontheweb.net/perelosukuxusewamogu.pdf
    • http://fibaxoxadomi.sportsontheweb.net/vegoxogatadina.pdf
    • https://cdn.sqhk.co/bugolajoxodu/hegjdhj/angry_fighter_attack_game.pdf
    • http://zesamoa.online/pubg_mobile_hack_android_no_root_apko5fx7.pdf
    • http://bellissimo.online/in_order_to_prepare_an_income_statement_using_the_account_balancesu6oqc.pdf
    • https://cdn.sqhk.co/letareximo/9ghhaid/download_ragdoll_arena.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rikolesafuwofar/partial_sum_of_arithmetic_sequence_worksheet.pdf
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_635f500d4aa64cd889df2fd54a178ea9.pdf?index=true
    • https://s3.amazonaws.com/navoburarovada/vb.net_game_programming_tutorial.pdf
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_f4c1972b0b7c48d6b17aee48f76b243a.pdf?index=true
    • http://bakevojedu.epizy.com/46108537558.pdf
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_1bd179834b624ebcac88d083d8724831.pdf?index=true
    • http://xefiposokupama.myartsonline.com/10th_class_math_solution_free_download.pdf
    • http://vumovofun.onlinewebshop.net/73314769089.pdf
    • http://vuzosade.epizy.com/64245502810.pdf
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_1bd2d4d1e0cb40878216b15b89e1524b.pdf?index=true
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_0660790af13b4620afee2631112bf023.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_off0000ee99.bin
960a36cf8e0c709c597202a23567d3e0f03053799e5f061492cc217fc66df31b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 5324 bytes
font_01_sfnt_off0001009a.bin
ebe11c12c107eb6874a557a488eb31f0a9fa09bea6b4b1fd70969a8052abe085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 10540 bytes

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