Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f3f258fdbed4aa…

MALICIOUS

PDF

83.1 KB Created: 2021-04-10 09:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 146817bfe3cdd8b517deb3d7a307b32a SHA-1: 374ec376ac8a209795c9a7560ec1f96dc8e5e620 SHA-256: f6f3f258fdbed4aa4c74eff8b131070691099b08f23dcd0e88162f758b14ad33
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pelibifir.ru/strik?utm_term=kinetic+energy+an+object+depends+on+what+2+things
    • http://radanukodufam.22web.org/fegafe.pdf
    • http://positarinirib.22web.org/live_tv_apk_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gusukeru.rf.gd/ropekipoxibuwefak.pdf
    • http://werokixa.rf.gd/financial_accounting_theory_7th_edition.pdf
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_15b04444797549a08a215f146665bffe.pdf?index=true
    • https://s3.amazonaws.com/vukusa/buxigeva.pdf
    • https://uploads.strikinglycdn.com/files/20b71942-8568-45aa-b038-4a117fb1d574/alcatel_one_touch_idol_3_price_in_kenya.pdf
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_a484b2d9b5524dceb6e04cc783d4ad81.pdf?index=true
    • http://wiratobut.rf.gd/15453747550.pdf
    • https://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_4a5ab75dfcef43ec894435fd20c3560e.pdf?index=true
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_66073b1a2007470b835d87725ae38633.pdf?index=true
    • https://s3.amazonaws.com/wazorixekunafob/ssc_chsl_2019_form_fees.pdf
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_54f7f2cbb4994f36b544ff02523e6330.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82a255d1-3810-4975-8b92-86ea69c54f62/how_to_draw_a_cartoon_dragon_head_easy.pdf
    • https://uploads.strikinglycdn.com/files/052bc715-c7b0-48f1-b413-fe3c9de5eb95/how_to_date_someone_with_a_girlfriend.pdf
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_b5f97a6d492a4de09a7c85291822b22a.pdf?index=true
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_089b5edf047440debffcd3030157e589.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2dd83385-68fe-4d98-8e62-75cb66fe6f5c/what_does_cl_error_mean_on_lg_washer.pdf
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_564bbb830471428ab6bb8db841fa9233.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2686096e-541f-465a-be36-6c9d9f4e44a3/49388216381.pdf
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_d877a2ebea834a60a4c07bd428dd6818.pdf?index=true
    • http://fixapesexarux.rf.gd/cuales_son_los_fundamentos_tecnicos_del_futbol_wikipedia.pdf
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_cf4dd9baa7214cd1a021405410f0d10e.pdf?index=true
    • http://lozufoxozaniso.rf.gd/hades_star_guide_deutsch.pdf
    • https://s3.amazonaws.com/gitipelut/converting_fractions_to_percents_worksheet.pdf
    • http://tixesujimi.epizy.com/divine_mercy_image_to_print.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ec.bin
3c54a274a738d3527b8947baec38d5f12c7ab789cc81278cdbff62dc4170adb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 5812 bytes
font_01_sfnt_off000117d2.bin
f6025459dffe5bca5d4d920c0f90b5f92657ddb08e0dad53a78b5f0cb507b983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 10540 bytes

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