Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2539f19f75d05ff…

MALICIOUS

PDF

120.5 KB Created: 2021-03-28 15:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 52f3f389a57b4402a9b9bb03053653e4 SHA-1: ee2ee000d91e6587da852d1d9298ad8621980c69 SHA-256: f2539f19f75d05ff298fe9646363e1bb612fe10ec0dc4c813c5912a54a57caa5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and 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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=which+teams+does+nike+sponsor PDF link annotation
    • https://cdn.sqhk.co/numovasovev/a5cDggO/hexagon_shaped_glasses.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486743/normal_5feff1657c8b6.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/jiSijb8/81470446051.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/3hhjjhB/topaxarereloge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_601d2cdf3ccd1.pdfIn PDF document text
    • http://savineme.mywebcommunity.org/aleph_borges.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/vizonasofe.pdfIn PDF document text
    • http://nunegotopexipo.iblogger.org/22142392736.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/jjVSKge/free_presets_for_lightroom_filters_mod_apk.pdfIn PDF document text
    • http://kumajamefe.getenjoyment.net/biblia_reina_valera_1960_letra_grande.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393635/normal_602624df2ce45.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/84016634259.pdfIn PDF document text
    • https://cdn.sqhk.co/mozozezowos/WjaMhwK/mijegalumejavexe.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/lujizobejulimogit.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_b1db41261d944073b7df82ee9662e748.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_7fcbbc242d494ae89535e6f565284c81.pdf?index=trueIn PDF document text
    • http://tifilow.onlinewebshop.net/pretty_little_liars_season_4_episode_24_watch_online.pdfIn PDF document text
    • http://wafibajew.epizy.com/a1c_eag_chart.pdfIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_ad4c5477bd3f41dd996a9e69503adbc9.pdf?index=trueIn PDF document text
    • http://dapufojutujat.atwebpages.com/vupilunideso.pdfIn PDF document text
    • http://warasokimujirij.epizy.com/80401382443.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00018469.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18469 10228 bytes
SHA-256: 5a40e46e2d0ab4c93691ef78835227f428d1f30c484011a5997892a9e584c5e8
font_00_sfnt_off00016813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16813 2900 bytes
SHA-256: 9c84aca5171cf4522e1fd23f3e5391e17c8e645cdcb740b4c3036af6865bd014
font_01_sfnt_off00017258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17258 5356 bytes
SHA-256: e8a8fe6fa54b3ab71d25b10a5c96188037f59c6b03a5c294b366e2575be1e1ec
font_03_sfnt_off0001a15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A15B 19176 bytes
SHA-256: 2a23ff2a6fa51d23875b626c69354db2588c5b653b624f7b59ba651891e6eef8