Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a9dedfa5890b3b…

MALICIOUS

PDF

76.7 KB Created: 2021-03-09 03:32:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0a8b2a96350d7a7d1035709715225495 SHA-1: c20d99a29fb57f233fc9803b7779d52d049209fc SHA-256: a3a9dedfa5890b3bb20cd6116a7f6111764595f8900599e60cb7509fbbacee29
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=how+to+get+into+pr+and+marketing PDF link annotation
    • https://cdn.sqhk.co/kixowijeka/igrWifP/sniper_strike_special_ops_mod_apk_android_1.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/denogumea4hk.pdfIn PDF document text
    • http://arm-watch3.club/bible_in_kannada_free5bc7s.pdfIn PDF document text
    • https://cdn.sqhk.co/batitiviz/3lidUpy/69836661237.pdfIn PDF document text
    • http://rodina38.ru/operate_now_animal_hospital_mod_apk8nfwq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_60300bc216afb.pdfIn PDF document text
    • http://micrometerdigital.xyz/literary_elements_worksheet_1_night_answersee5r0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476288/normal_5fd2a86b4ce81.pdfIn PDF document text
    • http://ig-copyrightviolation.com/acura_mdx_service_code_a123566qy6y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_603e6a6b99991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527747/normal_602709d2e8bb0.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/gf3K9jf/apn_movistar_venezuela_xiaomi.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/new_mary_poppins_movie_musicwzbob.pdfIn PDF document text
    • http://cyberghost.store/George_calombaris_thermomix_receptend0rlh.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/CDNhjhc/hearts_fc_news_twitter.pdfIn PDF document text
    • http://com-copyrighit.com/1480110535181wmw.pdfIn PDF document text
    • http://opendouche.xyz/88113827943c6vtw.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/lyYgfja/frases_tumblr_para_fotos_no_instagram.pdfIn PDF document text
    • http://flowerport.store/69255043497tpclf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_1c1357c400cb4deba7fd42a73afdab90.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_3ddeb4e40f61427e9ce4ab5b4d7bc0ff.pdf?index=trueIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_2faa3a98af914bfabcc8b99a6d035c83.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_4b86b7fb90074ca3acd25ae79dc629eb.pdf?index=trueIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_22ddaa3f5e6b4b52a387a0911e585eb8.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_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 5188 bytes
SHA-256: dba99fda7cc75d56af934c7619960a2cf09a44bd6a8e180cb9baac601605a8f7
font_01_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 10324 bytes
SHA-256: 2d22d02cc0c85299033b1e35c7357969c760aea1a241abef5a28c26112e10d41

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