Malicious PDF — malware analysis report

Static analysis result for SHA-256 724ec5db273599fa…

MALICIOUS

PDF

79.3 KB Created: 2021-04-14 21:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 51ab52a1c1af302e7ff6fa8d9da8170c SHA-1: 1e40618ceacad9cda1c34e4b7f8b08eb88528328 SHA-256: 724ec5db273599faa9a28d8ecb326b1c56098029ed55f2903e5fe57ac3b5b8c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 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/strik?utm_term=how+much+is+kx+pilates PDF link annotation
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/8955685.pdfIn PDF document text
    • http://1xbet-registr.site/wisotanexurodibunigvs5z.pdfIn PDF document text
    • https://lesoloruvurer.weebly.com/uploads/1/3/6/0/136028926/tizotuso_kigedixadojor.pdfIn PDF document text
    • http://yogist.fun/win_10_1903_feature_updater174e.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/c4386eb789cfa.pdfIn PDF document text
    • https://toxejezewigi.weebly.com/uploads/1/3/4/5/134513259/leweboze_wobuwidiluzevo_pazibivaz.pdfIn PDF document text
    • https://lenexemumuvag.weebly.com/uploads/1/3/1/4/131438583/vubesi-bisowakuxu-dukagener-foziz.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/12692500201.pdfIn PDF document text
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/lanafazimufofepuzuz.pdfIn PDF document text
    • https://fabobabi.weebly.com/uploads/1/3/4/6/134678451/6760357.pdfIn PDF document text
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/4124621.pdfIn PDF document text
    • http://crispyset.online/richmond_tankless_water_heater_error_codesjqrrm.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/xeribexugejepomaxad.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/apsrtc_bus_pass_application_form_for_ngoxn9hi.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/6334535.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/62080161734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45cbf65-946a-4215-80e8-cc08da7430a7/stairway_to_heaven_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/cdc_guidelines_for_chlamydia_and_gonorrhea_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/xegiruribedakeliribudowik.pdfIn PDF document text
    • http://wigifanike.epizy.com/sobotta_atlas_of_human_anatomy_vol_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61f0bcc6-2474-40f1-ac4f-2d5179028d2f/exerpeutic_900xl_vs_1500xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a48ec59-0334-4d7c-b0d5-b7408c3e8e94/lego_mindstorms_ev3_race_car_program.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/blackberry_z10_manual_software_update.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 5264 bytes
SHA-256: 83ad4ba237acafd5072eabd305e9668053cd39d883e27710b558e5574f06d619
font_01_sfnt_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 1892 bytes
SHA-256: 1fc12a375bcc3be3bb541ba0d2e75a9deb76d5cd30a42549199b3ff9798c8b1e
font_02_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 11096 bytes
SHA-256: 9db8307f8d27746359e3285b528660f01676fd19f26c57c9a856cac359850feb