Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4000f30449507a9…

MALICIOUS

PDF

80.6 KB Created: 2021-04-19 21:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 666b4e0661f2e4a96b6cafebaa2ba716 SHA-1: 6a509827fe69ad218c44f4b443558b0ca2a3d207 SHA-256: c4000f30449507a9aee8803bca364aacf7ce6cdb25af0e22caa4b1a7084aee90
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 0.9994

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://resalured.ru/strik?utm_term=who+played+the+high+sparrow+in+game+of+thrones PDF link annotation
    • http://wdd13.ru/eheim_automatic_feeder_instructions2kzuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6021ad993ac87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_5fd65fdf0a237.pdfIn PDF document text
    • http://cashbackk.site/empire_builder_amtrak_route_guidezevwg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_603d2f712b458.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/susesarozaravitoxul.pdfIn PDF document text
    • http://repochka.site/80091237039f0nw6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_604685d829f42.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/41210891321.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/dfb67fca-0ad8-4d93-b5cc-e077d9918c36/77250343930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14628f6d-fdbf-4281-9014-57503389b5b7/baofeng_uv_5ra_programming_software_download.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_15cfcfd087914111b274ad913bd4e3b7.pdf?index=trueIn PDF document text
    • http://tuzuxutetug.atwebpages.com/how_to_use_the_rainbow_vacuum_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbf6d7a-3b20-4907-8bb7-8cc80873f7b3/5892560856.pdfIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_0a4703f6972548f38f78f2451da3525f.pdf?index=trueIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_6539ae4d9da141c1b4b68579a79185ac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b83e17-385a-4a3d-9015-d512bc559058/how_do_you_reset_a_whirlpool_cabrio_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42f49ab9-279e-4c5e-af0d-5bcc9610457c/asus_crosshair_v_formula_bios_mod.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_02d10ffac34a469e891bac299a1c2307.pdf?index=trueIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/after_we_collided_full_movie_english_youtube.pdfIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_333c0e86198d4b57924e83beedbb0609.pdf?index=trueIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_1096b547ada64782b04f7b5a0888d6b7.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_efee5e146165441087c41fa62b076bc8.pdf?index=trueIn 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_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 5664 bytes
SHA-256: 92ef5797d15d2831311f5b290220162be48de3eeeeaeaa7643ad436a71209529
font_01_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 12112 bytes
SHA-256: bc1c81d29e0c8550e8de8c1ed37acaefe793ffcf2fa93f204c936088e9a3c5b2