Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fac45f25dcde4c…

MALICIOUS

PDF

81.0 KB Created: 2021-04-09 09:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d5bb1ca145d921ae02b5eea8f4544577 SHA-1: dd87f181721337288c8ad1576a9048cdabbc49b3 SHA-256: 88fac45f25dcde4ca8fccf913a83e92c87bbbf98f5310869a61237416000ba6e
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URLs suggests a potential for redirecting users to malicious sites or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=online+excel+training+courses+canada PDF link annotation
    • http://zonerokemub.getenjoyment.net/how_to_create_a_word_cloud_from_excel_data.pdfIn PDF document text
    • https://nadaroxiwe.weebly.com/uploads/1/3/4/6/134688146/68b27485286.pdfIn PDF document text
    • https://tizonitiwu.weebly.com/uploads/1/3/4/7/134734793/kuveruwixirogatuxek.pdfIn PDF document text
    • https://cdn.sqhk.co/rijakobebux/CkijVBE/fesapoxigurotigobetu.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/9923542590.pdfIn PDF document text
    • https://cdn.sqhk.co/tatakakuwito/dvlLkFj/tumblr_app_play_store.pdfIn PDF document text
    • https://cdn.sqhk.co/zenokosix/gfhejc6/19328864120.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/watchmen_comic_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wifuponi/hhiA8he/clouds_movie_cast_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/nimawabej/hegqi1e/99790335835.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/jgcgfic/madalogexol.pdfIn PDF document text
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/xuzutigugudofumu.pdfIn PDF document text
    • http://devigebogubiret.getenjoyment.net/international_energy_agency_world_energy_outlook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_9b84e72bbaba400b8bd2221ebf685303.pdf?index=trueIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_a761df82cd8a47c1940b4438edb1a2ae.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_521b68dfb6df42778a2d35247f6ca965.pdf?index=trueIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_9bdaa75646ed459fb61acfad9d6c0c03.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_d512b4dcd57240a0b297c238ff8b9c95.pdf?index=trueIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_dab0239639fb479f86f3af88b9018681.pdf?index=trueIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_a8db2fff155d4125b47ad06d0a409d82.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_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 5204 bytes
SHA-256: b9081d92275dd0014c185d758b133673d7ef97edf27d59b90e8bab881aa2718d
font_01_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 10880 bytes
SHA-256: 14b1475a3be920e6a2b8180e23a1d049f99e4c59e1e3d2eda6441492282e353d

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