Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fbae7e99a1d7ba…

MALICIOUS

PDF

77.6 KB Created: 2021-04-06 06:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 15f0f8172d0be67fdef657c8da9240a4 SHA-1: 6080f8a6159d855195644ed71de225c50d0eae05 SHA-256: f7fbae7e99a1d7babef42b21c89b060b57465757f497de6db4306f4698b163c2
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious websites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/award?keyword=princeton+review+biology+sat+2+pdf PDF link annotation
    • http://pixell.store/windows_server_2012_free_download_iso_64_bit_cracku02je.pdfIn PDF document text
    • http://fastcreditcheck.info/wokufo9yqv0.pdfIn PDF document text
    • http://nukicew.xyz/financial_manager_interview_questions_and_answers4ismd.pdfIn PDF document text
    • http://peuer.xyz/336936418732iibb.pdfIn PDF document text
    • http://wusator.mygamesonline.org/9_11_zoom_background.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilepobafomunow.atwebpages.com/samsung_grand_prime_pro_battery.pdfIn PDF document text
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_024eb26634ba40c196e71dcf12aac0c9.pdf?index=trueIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_b397c86bb1604faaaf5d347b0d5762cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90066700-7bde-4944-93c4-1e0b5c949ce0/data_structures_through_c_solutions_by_yashwant_kanetkar_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c9fd6a-97f2-4d48-bedc-f546e6502c28/how_many_harry_potter_prequels_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a05c789-57a3-48a8-a201-55ec5465353f/joreda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d913e8f-7f6a-4f4e-9b6e-1381140af993/wekigabifupifunefurujava.pdfIn PDF document text
    • http://sebokegekesuded.atwebpages.com/cuisinart_chw-12_automatic_coffee_maker.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_6a8dc00ad999492da778aa3781e98cfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a3c6d3d-0202-4b08-a9b6-037d133746f9/fibeled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a2a610d-78a5-4510-a87b-8ca9bcab91d3/how_many_calories_in_a_sonic_strawberry_lemonade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0388bcac-c4e9-434c-90e0-aa25eadac4ae/6204902386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/754c994c-5bb2-47ee-97ca-1ccc684fd675/tom_clancy_jack_ryan_series_season_2_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8603f0-978d-4a54-852c-e1fd2ec35d93/41953900129.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172b833b-720d-494d-8619-4a563c236d4b/making_amends_in_recovery_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bce0928-baf3-4808-beb5-01c712673b62/lofevinutizibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9afb7020-f8e1-49d2-bde9-13d58a8b1008/best_battery_tender_for_winter_storage.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_off0000efe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 5852 bytes
SHA-256: 9a97abd836922878649969bc55233e098851846412a0c9cc0f70b7cc64249438
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 10724 bytes
SHA-256: 97dff60a596d15fd3843b357939f9799a068d966fe31d51e37a9f3b54c5f04f2

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