Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5daa4a931e8f3a…

MALICIOUS

PDF

94.7 KB Created: 2021-04-06 07:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e8023414757fbc138bf124f001f69de1 SHA-1: 59a345f2c40d582f1a7dacebd225134df2e46189 SHA-256: be5daa4a931e8f3a5b9663484d6d2032d919f7197035609680ed6763897db2da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. The document's primary function appears to be acting as a lure to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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=medical+laboratory+tests+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/jotepomi/ehahhhc/jaxujutumuvop.pdfIn PDF document text
    • http://xabudumame.mypressonline.com/ragiwajogexemutowuvi.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/six_of_crows_tv_tropes.pdfIn PDF document text
    • http://soul-felt.com/581722827747tx6j.pdfIn PDF document text
    • https://cdn.sqhk.co/xupixawina/ifjaahd/3275173447.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/rokoposamebixakiwi.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/affidavit_of_bona_fide_marriage_example.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/7340435581.pdfIn PDF document text
    • http://euroshopmn.space/plumber_install_water_heater33ws8.pdfIn PDF document text
    • http://sugameloxufe.mywebcommunity.org/57826248856.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/die_analphabetin_agota_kristof.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/fluent_english_speaking_classes_near_me5ddzq.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/caleb_maddix_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tubawonidas/iiDjggh/percentage_calculator_increase_between_two_numbers.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/ficghQG/wupipasejovesife.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/jfhakjb/84420837772.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_0b1c6a6239a445b5bbbc139a24a2819a.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_9ecbfe1200f545e58bd8a99cb18a44bd.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_b0182e04e8f54daa85c8d9c1f2d7f5fc.pdf?index=trueIn PDF document text
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_6ad11871eb7e4187aec9fd724cbea3fc.pdf?index=trueIn PDF document text
    • https://6d0c6d30-55b9-4b7f-8145-34d11b484ddf.filesusr.com/ugd/8db56d_f89d114335404f35bf46c8626aaf79f2.pdf?index=trueIn PDF document text
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_b9d3f61e30dd47c4ad24f46ffb9d643a.pdf?index=trueIn PDF document text
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_608a40dbef5b4d498461052456158d6c.pdf?index=trueIn PDF document text
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_a05884280d4f434ab577a224eea4328f.pdf?index=trueIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_9900eb31f380446db9ab140b135d05cb.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_93a20ec52c8e496780ca6a56f5e8bc03.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_off0001301f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301F 5548 bytes
SHA-256: f524e20c4b844f15c040fc8d1709d2fba4ca8e485b03644298e6fae1f0ff1b81
font_01_sfnt_off000142f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F2 12360 bytes
SHA-256: cddda567ae36a8e7bd570b0e08b45aea1952b36552a4a24975d7392a6fbb6c6e

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