Malicious PDF — malware analysis report

Static analysis result for SHA-256 8129dbd4e0d250ab…

MALICIOUS

PDF

77.6 KB Created: 2021-03-13 13:01:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 802ed21fbb90144728fd3260c7370ecb SHA-1: 11885c1f7e7041853f5f508f73ae9abb41af91ac SHA-256: 8129dbd4e0d250ab1200f5d529e252e3b610ce0161ea73c3012e520be876feac
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 0.9993

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/award?keyword=june+barcarolle+piano+sheet+music+pdf PDF link annotation
    • http://kopalirigel.mypressonline.com/how_to_remove_pimple_marks_fast_in_hindi.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/cant_print_invoices_from_quickbooks.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443809/normal_5fd6149f1416b.pdfIn PDF document text
    • http://natorg.fun/what_is_the_difference_between_phthalo_blue_and_prussian_bluekdvp0.pdfIn PDF document text
    • https://redikuvemezu.weebly.com/uploads/1/3/4/8/134872152/buzupuzevefasi_beforedexewibaj.pdfIn PDF document text
    • http://cleaner360.shop/352146359282bvd3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410222/normal_5ffe53ceac2a7.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/social_contract_theory_examples_in_the_philippines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_604b2d8a953ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501206/normal_5fd0febdb2831.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/why_is_my_dish_remote_not_working.pdfIn PDF document text
    • http://7lessons.fun/how_to_study_for_fpgee_exam8f9eo.pdfIn PDF document text
    • http://numitofipepo.iblogger.org/google_maps_florida_panama_city.pdfIn PDF document text
    • https://vemisalisak.weebly.com/uploads/1/3/1/4/131437925/08ef7.pdfIn PDF document text
    • http://snail-case.store/myers_briggs_test_historyu7ci6.pdfIn PDF document text
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/dixitolaxe-vorolitomeruxov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496571/normal_5fffb8ba318a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_70f3e3e92ce94ac2b583b99c74ba30bb.pdf?index=trueIn PDF document text
    • http://rojarapimavokiv.rf.gd/2011_chevy_traverse_3.6_oil_capacity.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_1460bd461eb74e6a933232010a4250f2.pdf?index=trueIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_0c6b89f4f06f4ffe9d737e730181ab00.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_c4716208cf7c4f518e0abac31273433c.pdf?index=trueIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_71551938a63b4eff967a9ce89c2f91d0.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_off0000f175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF175 5524 bytes
SHA-256: 2eec4a7885dbb26a367a55635f7f19a4b91ce434882ea58006d383e6d499fd44
font_01_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 10748 bytes
SHA-256: f939ac931d8384540c584adcbd5cd1257547b8819d4bdceaff64917f1b3cc878