Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdbe0d91045cd72…

MALICIOUS

PDF

75.5 KB Created: 2021-04-01 08:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 693f11f02fd79b545c720fe5dfb531ee SHA-1: b3b5b40bfad1d17d08e5c8b3e0e91fb72671b1d9 SHA-256: 9cdbe0d91045cd72563e1905ff5d12a71559844803fcafe65a66e2c33da9c242
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on 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. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/123?utm_term=jaipur+golden+hospital+lab+report PDF link annotation
    • http://jetulugu.iblogger.org/ap_english_language_and_composition_exam.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/hhVsWF2/ganiveguju.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/bNzigCe/snow_white_costume_diy.pdfIn PDF document text
    • http://nulepunu.22web.org/23864463229.pdfIn PDF document text
    • http://pafiwuz.66ghz.com/alice_in_wonderland_spartito_pianoforte.pdfIn PDF document text
    • http://miguxinam.22web.org/49453457277.pdfIn PDF document text
    • http://pupofikavize.iblogger.org/93902102680.pdfIn PDF document text
    • http://votixowet.22web.org/pmay_gramin_application_form.pdfIn PDF document text
    • http://gizejiparo.iblogger.org/rock_guitar_arpeggios.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/Pjbhabp/54628283907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widopux.epizy.com/42960053555.pdfIn PDF document text
    • http://banigigafizaje.epizy.com/zavaragu.pdfIn PDF document text
    • http://ronufabadexulab.epizy.com/drama_korea_cheer_up_subtitle_indonesia.pdfIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_25fc2b6586404bf8a7f7ab0d58af78b6.pdf?index=trueIn PDF document text
    • http://gidegezujonin.rf.gd/geneji.pdfIn PDF document text
    • http://dudaturid.rf.gd/mla_8_in_text_citation_report.pdfIn PDF document text
    • http://zidetunoz.rf.gd/what_do_jesus_christ_lizards_eat.pdfIn PDF document text
    • http://gomitobovuni.rf.gd/26087389305.pdfIn PDF document text
    • http://xuzexotunel.epizy.com/how_much_do_you_save_in_the_52_week_challenge.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_1eb8fc2c5d804e94acd871f3df40f7eb.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_d9fa7b632f7f4bf4bfcfd47b8cb899ba.pdf?index=trueIn PDF document text
    • http://zamutodud.rf.gd/wofewovaxiwijuvuniludige.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 5348 bytes
SHA-256: 873e67f25f38c366ee842f036b34a13c10b7bd278e993d878069b286f8d59f5b
font_01_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 11444 bytes
SHA-256: ba98f7ad81c84e20bc6946098ce273164dd7c386886c1b69bc6599af8c58b34a

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