Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c95e220b85466f…

MALICIOUS

PDF

80.2 KB Created: 2021-03-17 06:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 792ea3e2ad9bfa2bf2a0f6cf0d7877c4 SHA-1: 9d24868be8521b31058afe52d9db602e23f0e5cf SHA-256: 42c95e220b85466f0598b650de333bafc686f485f491f09042bd1761a8110311
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9954

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://jottigo.ru/wix?keyword=el+ser+humano+y+la+naturaleza+filosofia PDF link annotation
    • http://businessoutsourcing.org/nuzunomunapegax1e0ir.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzomowa/idKhjia/vidangel_free_trial.pdfIn PDF document text
    • http://invitesistem.ru/5833766321pg3qt.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/wujfahg/kozezinilakuzav.pdfIn PDF document text
    • http://kekemubitaf.iblogger.org/tiwemoxugiwazokalalur.pdfIn PDF document text
    • http://pixerofojoka.22web.org/97263132251.pdfIn PDF document text
    • http://steblin.pro/95193616355irkn3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_602f3d729b775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_60120f52e5a47.pdfIn PDF document text
    • https://cdn.sqhk.co/tikalijit/j84ghdz/pa_immunization_exemption_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426085/normal_5ff3ff4100db0.pdfIn PDF document text
    • http://difanogoz.22web.org/memuxuput.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/jbgajff/lulilatisarumaka.pdfIn PDF document text
    • http://bluetea.space/66081103108c7cgl.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/0igZYBH/777_classic_slots_vegas_casino.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
    • https://uploads.strikinglycdn.com/files/72cbfb63-d025-4da2-8eda-e528a8bb428f/womokuwexozulareleniro.pdfIn PDF document text
    • http://botasalipigu.epizy.com/wumomonijemenenejudodewur.pdfIn PDF document text
    • http://lekirajadu.epizy.com/tesamutuwefasipofoneg.pdfIn PDF document text
    • http://fipabadidori.epizy.com/spelling_and_grammar_check_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f209291-190b-480f-ae17-b95eb4c0fd23/wikigofezitoridasusu.pdfIn PDF document text
    • http://wabeworozad.rf.gd/creo_parametric_4._0_installation_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7885e0f7-ee88-42f9-9a15-3c94cf1cc32c/ejercicios_de_trigonometra_tringulos_rectngulos.pdfIn PDF document text
    • http://juvugakor.rf.gd/ahsaa_athletic_physical_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fcddc02-3957-412c-8c42-0de68b96ad3d/samsung_xpress_c460_series_driver.pdfIn PDF document text
    • http://dojomasamolazib.epizy.com/kodise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c223bf-1d79-456f-9925-e4591ccc1249/what_comes_after_after_we_fell.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 5000 bytes
SHA-256: 4f2413ced3c8e38f3dd2e78147de88a7e455c8b6d52bdb5d9f999c8987f1355c
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 11680 bytes
SHA-256: 6abee39ec45be2343fe5c514d5b7b450160b2ddcc05d6ad12977c580d7313d15
font_02_sfnt_off00012334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12334 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378