Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea9a1a921107daf…

MALICIOUS

PDF

89.8 KB Created: 2021-04-03 12:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1596ab1a46d0877e1bc7c002bab794e6 SHA-1: 17868e6917175427d234e8e2e814a6e19dfbb96b SHA-256: 4ea9a1a921107daff0865a2f7055a50db329a9db09de48939aa0ce4a1acdcf8a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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=chatuchak+map+pdf PDF link annotation
    • http://trysoda.club/vigokedukusagezatolepifus0szh4.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/ZGgigzs/army_fitness_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/zimamoko/iagdhj7/borland_database_engine_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/cgqOifI/gusogi.pdfIn PDF document text
    • http://rupazaduxil.mywebcommunity.org/english_bible_free_download.pdfIn PDF document text
    • http://samoe-samaya.ru/kotujidubal0apz0.pdfIn PDF document text
    • http://konosabidirawu.22web.org/wuxes.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/jcGIXBK/word_chums_cheat_project_lexicon.pdfIn PDF document text
    • http://klyshsheff.xyz/pigeboleluwep0imye.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/wofenigofelo.pdfIn PDF document text
    • http://spencermcman.us/dapumazanupuxowanowanopefl5wn7.pdfIn PDF document text
    • http://wixujikubipom.mygamesonline.org/mojejifuzirexaso.pdfIn PDF document text
    • http://blue-tick-central.com/bemofobajdjlbf.pdfIn PDF document text
    • http://tesopinafap.22web.org/imperialism_and_world_war_1_test_answers.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/marketing_strategy_types.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_cbdd46c28e8c4bb2b1f55f5a975447fe.pdf?index=trueIn PDF document text
    • http://metiguwuwezaza.atwebpages.com/50245830468.pdfIn PDF document text
    • http://janivasolirife.rf.gd/putokorawexubebepibeze.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_7c70d2bbf6f541cbbcad347a803ed83f.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_381b0170060b47f4b98f3c1fe74763ee.pdf?index=trueIn PDF document text
    • http://tanasebebibe.epizy.com/niror.pdfIn PDF document text
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_da69def4ffad4e04a95027ed90de0161.pdf?index=trueIn PDF document text
    • https://681956c7-2c57-495f-b996-d04b50c745b0.filesusr.com/ugd/907d98_e20e70477177466b90605bf419c32f69.pdf?index=trueIn PDF document text
    • http://xamilelamijokuk.rf.gd/carniform_extreme_shot.pdfIn PDF document text
    • http://desuvusemexemob.epizy.com/51322739068.pdfIn PDF document text
    • http://tifilumiteva.epizy.com/ladojuvarodadiluro.pdfIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010c60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C60 13640 bytes
SHA-256: 1fa0300bd2c15da62c0546589cfb92de884d0e747192bbf287046e57b1d38d42
font_00_sfnt_off0000fb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5C 5056 bytes
SHA-256: 1728f0f8929db0c063eb3b838a93d3ba821f9e5354599c2b3762f5f8cbe7c309
font_02_sfnt_off000132ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CE 11452 bytes
SHA-256: c2e3fafa9a9d220ec261c217273d9f0546862f8b26c0d974da5231ad6be6abe9