Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1d50bdc590d204…

MALICIOUS

PDF

81.7 KB Created: 2021-03-13 15:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 638c7f22b2c0fd9bd58143d452d03c66 SHA-1: ea6a2cbf8f5d78f751b940bb8d3d821b40df738d SHA-256: 3b1d50bdc590d204d46ac730d3c90dd0dbdc6f9e428b9890b02c20bdb02f2d10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. While no scripts were directly extracted, the structure and heuristics point to exploitation of PDF vulnerabilities to redirect users to malicious sites like 'gimoguvi.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gimoguvi.ru/award?keyword=compare+and+contrast+essay+sample+pdf PDF link annotation
    • http://vedovipog.22web.org/96644219531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_602a1252a0f50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490961/normal_5fddf4b2706f0.pdfIn PDF document text
    • http://sait-ok.ru/punamutekiwomiwd8.pdfIn PDF document text
    • http://gikepofazanapol.mypressonline.com/free_radicals_metals_and_antioxidants_in_oxidative_stress_induced_cancer.pdfIn PDF document text
    • http://temppicture.xyz/daravabekivis6xrjm.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/hanging_bell_bird_feederc5nbh.pdfIn PDF document text
    • http://bratskpravojur.ru/4221359893kvi6g.pdfIn PDF document text
    • http://xivixevikid.iblogger.org/bemobapegabokadasux.pdfIn PDF document text
    • http://naturfresh.fun/epson_surecolor_sc_p800_maintenance_tank4j8c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483104/normal_5ffece1b91e16.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/bellini_intelli_kitchen_master_recipes.pdfIn PDF document text
    • http://jevufoduxixan.22web.org/15596071918.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3325ae09-8643-4bea-8463-293c4836c938/53368782884.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/24454823677.pdfIn PDF document text
    • http://bogigipoja.epizy.com/dakuxidazelokozizexam.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/logical_reasoning_questions_answers.pdfIn PDF document text
    • http://takoxun.epizy.com/worufeji.pdfIn PDF document text
    • http://bavixefavidevok.epizy.com/2864390223.pdfIn PDF document text
    • http://romevakamijoke.epizy.com/dave_ramsey_financial_planning_book.pdfIn PDF document text
    • http://vekabun.myartsonline.com/where_can_i_donate_clothing_during_covid_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d51c41f2-a872-47e2-8a87-47fb33355490/56704757920.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 5164 bytes
SHA-256: 204920edcea579d50e142d3ddc1327d408aaa286259b3a48fadd228efc276f6a
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 11028 bytes
SHA-256: 662cbb8d2db9626a91cac0fdd35f7353b52e4c3e3170b4673114262d56f47f76
font_02_sfnt_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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