Malicious PDF — malware analysis report

Static analysis result for SHA-256 f912a6874d4ebaed…

MALICIOUS

PDF

84.1 KB Created: 2021-03-15 09:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f7cf2341be57b63b276da742342281fd SHA-1: 81568ea98c85b75becf7ec61b68dd0ccb2e449a0 SHA-256: f912a6874d4ebaed5b98aff75551808c62caa93b15fa5387ae82731fc128e95d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The document body, though partially corrupted, indicates a lure related to a 'Rii k18 wireless keyboard manual'. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vilenefex.ru/wix?keyword=rii+k18+wireless+keyboard+manual PDF link annotation
    • http://xasujaru.22web.org/gds_committee_report_latest_news_2018.pdfIn PDF document text
    • http://sijazoge.iblogger.org/sorolotoperuvuva.pdfIn PDF document text
    • http://dowobunirarifu.22web.org/safowusopixo.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/vilixalajixebigawifag.pdfIn PDF document text
    • http://xizerunax.scienceontheweb.net/biblia_reina_valera_1960_con_concordancia.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/gabixalapafirewemuf.pdfIn PDF document text
    • http://lamejix.scienceontheweb.net/soxanoronukazopejupomorok.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
    • http://gexegufikide.epizy.com/gloomy_sunday_1999_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/jejowikema.pdfIn PDF document text
    • http://jeromipaxipuda.rf.gd/o_reilly_books_python_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/phet_balancing_chemical_equations_html5_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcd3955-d04b-4417-9b4e-c2ed2a3ee7ba/tifanedoxupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7e258c-0b50-4c1c-bcad-e1e7910145a9/18935260447.pdfIn PDF document text
    • http://zoletafexogixa.epizy.com/nhc_thiu_nhi_c_heo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf81f7bf-5c34-47c9-abfc-972a0430b1b4/dance_with_dragons_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8ff178f-06b1-4d5f-a149-9e4082275ab9/74555931905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1788e91-5424-425a-9b3f-e3cdd3629f28/16009123604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/975f6838-3add-4174-bdd9-849be08b6202/jj_10_day_juice_cleanse_recipes.pdfIn PDF document text
    • http://vuzuwukef.atwebpages.com/test_de_aptitudes_y_habilidades_ejemplos.pdfIn PDF document text
    • http://dalonirutufitad.rf.gd/how_many_calories_in_a_dunkin_donuts_vanilla_chai_with_almond_milk.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/marketing_mix_free.pdfIn PDF document text
    • http://gagonunanu.epizy.com/car_games_free_for_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f87c77-e00b-4e41-b6a7-fe83fecc72cf/lg_g_pad_7.0_wont_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a9c228-28eb-4230-ab14-440f858e4aa8/92876634159.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 3132 bytes
SHA-256: 23535bb7f8169fe5a5da0a71bcf76ae2a94637825babe6b4d841b7af01867cb8
font_01_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 5424 bytes
SHA-256: 772fecf078df770d695134a2ba196586c7d8ac1123fc6faccd33abc2901366a2
font_02_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 11648 bytes
SHA-256: ca9a386e813d8e8849b97b38c75c1e75c7db2182e32fbae2e975d3bd55520beb
font_03_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 16260 bytes
SHA-256: b1b93bf558ee65cf174bdde98fc70b39c77ddcfeef9d3a00758a58eb2f24951c
font_04_sfnt_off00013236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13236 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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