Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80c53c4de590399…

MALICIOUS

PDF

75.0 KB Created: 2021-04-27 00:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c58d2106b70742c628d39e1d269d0777 SHA-1: 73957636a354a3bb228012b27b0942c7854809ed SHA-256: f80c53c4de590399d879cf097958d6610c69f3aca692947450bb0ac0c50ddce7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, containing a large number of external links pointing to various domains, many of which appear to be disposable hosting. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a mass of external PDF links. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://botokaw.ru/strik?utm_term=environmental+impact+assessment+india+2020 PDF link annotation
    • http://dodunagosukew.iblogger.org/employee_progress_improvement_plan_template.pdfIn PDF document text
    • https://jipaxebuperiw.weebly.com/uploads/1/3/4/7/134751602/a931546.pdfIn PDF document text
    • https://turabebusaweni.weebly.com/uploads/1/3/1/4/131438207/netodorevol.pdfIn PDF document text
    • https://movimuwetimegi.weebly.com/uploads/1/3/4/3/134342740/57ca7.pdfIn PDF document text
    • https://boxijapemisavar.weebly.com/uploads/1/3/0/8/130874030/befabeg.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/vipezefamizezapaman.pdfIn PDF document text
    • https://bovuxugiz.weebly.com/uploads/1/3/4/9/134901291/kopikoxuxud.pdfIn PDF document text
    • https://mofutobanu.weebly.com/uploads/1/3/1/3/131383854/nidinivaluwo_pavobujorep.pdfIn PDF document text
    • https://zobupasig.weebly.com/uploads/1/3/1/4/131438120/gawomow_nikumufedomo_kamaronewifojer_zawelozo.pdfIn PDF document text
    • https://jijaxiwiruba.weebly.com/uploads/1/3/5/3/135333012/vumosedufoxukegabori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepevakadiw.rf.gd/gatijuzedazomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5970e2-54f4-4ea0-99f6-7b4a9e8be811/50294156994.pdfIn PDF document text
    • http://xafalelo.rf.gd/copper_for_busbars.pdfIn PDF document text
    • http://rubilogolimof.epizy.com/97089388403.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57cdd7e-9218-46ff-a2be-50dfc642ba39/55763649262.pdfIn PDF document text
    • http://tugoxejemikoze.epizy.com/braid_pc_game_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16026df0-eb79-44be-b8ec-b73cffb50e2f/40105452060.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebabd4c-08ef-4ede-adcf-96f1ed6630e7/musugudolad.pdfIn PDF document text
    • http://sabozet.epizy.com/27322455465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7527f57b-989b-4cfd-a309-dbdaf12b32ec/shinco_portable_air_conditioner_manual.pdfIn PDF document text
    • http://foretoxute.epizy.com/greeting_card_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/838eb77d-9a5c-4343-a74c-f0065a4b26f1/how_to_report_linear_regression.pdfIn PDF document text
    • http://deronug.epizy.com/56536322386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa6660c0-30b9-4fca-9a71-3a53e66d7446/mercury_outboard_motor_service_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb68c85-a345-4632-bbf3-e04b49fcf92c/metal_gear_2_solid_snake_rom_nes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a26d7d-f2e0-4009-b697-23b7d34a6fad/american_history_timeline_1900_to_1950.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_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 5508 bytes
SHA-256: feb4bd99b1f8c2ff534a6a0b9b30ce47f2b361b62f78b782e177c6cf77dac1c0
font_01_sfnt_off0000fa0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0F 10540 bytes
SHA-256: e5acb0c6812296d3547f23ff3a10b435bad5ad302034d3b8028707f85112fdee