Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef0e4761b178273…

MALICIOUS

PDF

126.0 KB Created: 2021-03-09 09:22:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8f6ad68431f7425e7a8e849dd798f198 SHA-1: 6776ae4311e3b5b38c879b190cee0e873aa91bf8 SHA-256: 0ef0e4761b1782737a773bbeacfb34c417a638c91f253cb117f9132f8a0cfc0c
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate maliciousness. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs suggests an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://druttle.ru/award?keyword=cutting+edge+thinking+and+practice+pdf PDF link annotation
    • http://ig-soft-team.com/49825387795cftcy.pdfIn PDF document text
    • http://axecheat1.xyz/columbus_blue_jackets_schedule_today4e0lq.pdfIn PDF document text
    • http://mon-cmso.best/magnum_x5_airless_paint_sprayer_for_salef7yeh.pdfIn PDF document text
    • http://nokexukuzifuv.22web.org/kovojufugupuver.pdfIn PDF document text
    • http://upgrade4me.com/98043281096h6m7v.pdfIn PDF document text
    • http://msertis.xyz/kadizuzua0r29.pdfIn PDF document text
    • http://xiwikene.iblogger.org/17232690117.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/558ad69b-6963-417d-8247-61f396002639/tamiwajemejilike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63196d74-bf53-4ea6-a815-c251b4eec94c/ipad_mini_2nd_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27b7ef7-7503-45a0-a78b-f19b766fc4c1/book_report_examples_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df5ce20-5823-4809-aae0-6326050d333c/panasonic_cordless_phone_troubleshooting_no_dial_tone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e24f4a-47a4-4ea7-a195-9003bc3e4d97/verogaraginidabizetotipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f00fb99-247c-4f19-b869-cdbd95396522/79106012275.pdfIn PDF document text
    • http://puwavunetese.rf.gd/see_me_nicholas_sparks_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be940c9e-b302-43b4-b282-a7ddcb529a03/the_wanderer_johnny_cash_lyrics_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a54c907-d8cf-4632-90d2-c8e8b46fc2ce/the_gnostic_gospels_of_thomas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e698c67-e6ab-4f54-930c-27573eb85484/drop_baby_drop_ukulele_riff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c1cb9a-d833-430f-b588-94be8275df53/makegukazodinuso.pdfIn PDF document text
    • http://zedoliwitimevaf.epizy.com/purigejusas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8beff8a-af0f-42f6-ad99-50f5d2e4836d/pulexun.pdfIn PDF document text
    • http://wijogural.epizy.com/acurite_digital_meat_thermometer_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9425280-7fac-4eed-8834-0cab8b543304/kipepilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e5a98f-02dd-482d-ba52-25caef32b4c9/how_to_unlock_lg_smart_drum_washing_machine.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B04 6744 bytes
SHA-256: 048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
font_01_sfnt_off00019be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BE9 5176 bytes
SHA-256: 85dd1c69b33101875c5b76d448bd204d8eb5d332d03c346e0695179f93edad32
font_02_sfnt_off0001ad83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD83 10920 bytes
SHA-256: f228e8f30630e641a9fce456d46cd44b3ceb2039867dab5a4cbfbaf10ef77018
font_03_sfnt_off0001d2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2E4 16076 bytes
SHA-256: 5617ec9627a8ab3ec6258a90d9208e20427de2a6b8b5195bb6b34d6d8d69fe18

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