Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d3621540d1f001…

MALICIOUS

PDF

79.4 KB Created: 2021-06-10 23:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4fd1e6f02dbe4c4713ae7760f8d5f84c SHA-1: b816d41b68291cc817e0bbb73bdf9999bf254509 SHA-256: d8d3621540d1f00163c418795f80410b40a67fdcfc23529a7eb52985be584eeb
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. 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 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://fokemale.ru/123?utm_term=vaio+battery+care+windows+7 PDF link annotation
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/cc90d978851c6.pdfIn PDF document text
    • https://xowasesulozuvuv.weebly.com/uploads/1/3/5/3/135347394/2015658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_603b005bc231a.pdfIn PDF document text
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/pipitoxadamo-nowasile-gafexitokumun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366653/normal_5fd08f329a82e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403688/normal_5ff57567f1de8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_60391187004fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482215/normal_5fe71610a8a85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5fec40bf076a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530429/normal_5fe4e9e81aa9f.pdfIn PDF document text
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/8759796.pdfIn PDF document text
    • https://xumexutibivuw.weebly.com/uploads/1/3/2/6/132680998/wolotenolexe-konafurozaluz-bawazelijixixe.pdfIn PDF document text
    • https://lotigasi.weebly.com/uploads/1/3/4/7/134705720/wanulapewuzutakate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450728/normal_5ffbbb7899afc.pdfIn PDF document text
    • https://ponukikoruxa.weebly.com/uploads/1/3/4/3/134343798/nutefuja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatasulupu.pbworks.com/f/pufodikuvidawifiwipeze.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144573420/69019726808.pdfIn PDF document text
    • http://zetewufor.pbworks.com/w/file/fetch/144669351/conclusion_rapport_de_stage_bts_immobilier.pdfIn PDF document text
    • http://bulafiko.pbworks.com/f/best_video_recording_app_for_android_2018.pdfIn PDF document text
    • http://zuvumuname.pbworks.com/w/file/fetch/145054905/memo_writing_exercises_with_answers.pdfIn PDF document text
    • http://mokapuv.pbworks.com/f/6451883540.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/f/zosabusenovaf.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/f/shadow_fight_2_special_edition_hack_version_mod_apk.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144583341/ritmos_desfibrilables_y_no_desfibrilables.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_off0000f736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF736 5280 bytes
SHA-256: aeb81ec9a982e3cbc087e897d38fe2792b5fe395b01335e02adc111bd52cdc7a
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 11808 bytes
SHA-256: 0d7ad2c080a219fdb85f155a3e5bde14d6880057a73b7d392144343da3ff9650