Malicious PDF — malware analysis report

Static analysis result for SHA-256 66adb8f98372fefb…

MALICIOUS

PDF

78.7 KB Created: 2021-06-09 23:55:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98d139d74698a6c689ba3781108c0f4c SHA-1: 02d9bb61e6750c459abce231fbe0d30834901fac SHA-256: 66adb8f98372fefb389641849090f9408cfabf00e93753e03d292c131bc0f423
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cructi.ru/pbw?utm_term=naruto+online+mmorpg PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472198/normal_605b0e736aa5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412599/normal_60bd35b20306c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389830/normal_5fcb9ef8ceb54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_602ee548ec07b.pdfIn PDF document text
    • https://zugexegepu.weebly.com/uploads/1/3/4/7/134740595/juvakavosif_turodikata_levut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490127/normal_605fa2f93ee3e.pdfIn PDF document text
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/jigakag.pdfIn PDF document text
    • https://xikumafugab.weebly.com/uploads/1/3/4/8/134878264/kizife.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/sefija.pdfIn PDF document text
    • https://senabexe.weebly.com/uploads/1/3/4/2/134265557/towupemuzebapub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465907/normal_5fd5f048f046f.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/926eaeda-274e-4e78-bacd-34c5d993de16/jidutanifebiwiwuvimefuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/017e81aa-04cf-46a9-a6b4-0d81abaf7809/whirlpool_gas_water_heater_pilot_light_will_not_stay_lit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdfc847c-3dd3-4228-9bab-87c8a7415a5b/xutoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59500252-b2bc-47fa-aa8b-7e931aec46f2/kiketifaberokaxox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c770713-5165-4ced-ab70-eb4a70f02f67/diet_chart_for_uric_acid_patient_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21601a73-9f42-4f15-b217-e72eb80b339b/sixth_presbyterian_church_washington_dc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a0d10d-0368-4d39-a525-f1b492a559d1/spirit_blossom_thresh_chromas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dfa6323-f7f5-4bd5-a2a3-c3db2282c6bc/what_is_the_value_of_a_2005_chevy_malibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc037084-3991-40a4-bbf5-6e2515cd79e6/98541043948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42cfe4a0-39a9-47bd-9704-0902837f72fe/what_is_the_parental_control_pin_for_nintendo_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2815ad60-30e7-418d-859d-ccda924e8bd4/50020815453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59b0e010-66b6-4757-a1a5-4f42286c6d25/supertramp_logical_song_drum_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76f08d2-064f-4b8a-bfa4-f33ef293fbe9/2002_honda_civic_owners_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 4932 bytes
SHA-256: 239e121fb68611ac1aca8f0d1c27dabd3cb651281f504e1c947cc36415910ae5
font_01_sfnt_off0000f245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF245 10888 bytes
SHA-256: a1994d18e5308a254da34b98feb9fa78b8fcdb37ee29276e30e76fb67acc9a88
font_02_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 16084 bytes
SHA-256: e8051d68498e63029d7c34361d406bcd46815681d18da0e8952f0660ee027cca