Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c549e5120ce463…

MALICIOUS

PDF

77.9 KB Created: 2021-04-08 07:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 32ce0ac20b9294992d6394f08225bd09 SHA-1: b32fff838d8bd67fe8099956c372ca0c2d1bdc4d SHA-256: 61c549e5120ce463f5fd3c6a49e56ce6b5bf68cb4cd1bbf6e1d28d0065eeda0f
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 0.9991

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://resalured.ru/strik?utm_term=how+much+are+sonic+half+price+shakes PDF link annotation
    • https://cdn.sqhk.co/wodelaganav/hjBLphg/abc_song_interactive_nursery_rhymes_for_babies.pdfIn PDF document text
    • https://cdn.sqhk.co/dogatefi/igq6giR/7769928358.pdfIn PDF document text
    • https://sedawuxel.weebly.com/uploads/1/3/5/3/135326539/fazelusetefun.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/c5heStP/gimabam.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/jxOjftH/61353818716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd7ea572fcdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390057/normal_5fe15d184e1d8.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/26017680286.pdfIn PDF document text
    • https://nirumoxizexajiv.weebly.com/uploads/1/3/4/5/134524745/goramax_virav_migetefexe_vutawuzus.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/antibiotic_resistance_protocols.pdfIn PDF document text
    • https://jaxuguduju.weebly.com/uploads/1/3/4/4/134442137/a64f197e35bb065.pdfIn PDF document text
    • https://gipenozup.weebly.com/uploads/1/3/1/0/131070487/lakezepadamideridek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374986/normal_6007e2a809416.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/gig8ggC/fast_notepad_2._0._9_apk_obb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wonanikapudidak.atwebpages.com/why_does_diesel_smoke_white_on_startup.pdfIn PDF document text
    • http://kunibenurupamiv.rf.gd/basic_object_oriented_programming_concepts_in_java.pdfIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_6b230006b5c8470e873173235c06c278.pdf?index=trueIn PDF document text
    • http://beguresenoraw.epizy.com/77843691650.pdfIn PDF document text
    • http://likewiwojuxus.atwebpages.com/cancionero_de_cuecas_para_guitarra.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/cabinet_mantri_2020_list.pdfIn PDF document text
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_ae78300c38894e5f8752645cb5940a9c.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_e86913bc0d814922a4253b74bb57a396.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_bec49cfd332549218fe96abdc4b83740.pdf?index=trueIn PDF document text
    • http://mazavenekixibu.rf.gd/5195310529.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD6 5372 bytes
SHA-256: 4a644a20030df0119a1a575b1a2a14a5fc6eb400ea9de51a455ce2dea72082d5
font_01_sfnt_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 12040 bytes
SHA-256: 49650f515263bc6be24ccc80702a3fca45c6bd021ea1a67a25ec11ac68eea488