Malicious PDF — malware analysis report

Static analysis result for SHA-256 826fa214deb0ad92…

MALICIOUS

PDF

77.5 KB Created: 2021-03-27 15:10:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2cd03a29e35c29e495a93e5ae8d35475 SHA-1: 1e708e1348447d3ef976cc558e12437fe3d8f5b9 SHA-256: 826fa214deb0ad923c55405b0fed8239d6c75ed6a41d7ffa73474c8f701e6ec8
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 0.9991

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=why+wont+my+shift+gear+move PDF link annotation
    • https://cdn.sqhk.co/xuluriwu/ingdxge/forest_stream_live_wallpaper_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420775/normal_600d274af02a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_6014e7ebc4c67.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/njijfje/business_strategy_jobs_london.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/nghk4Uw/download_fast_racing_2_mod_apk_android_1.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/qumica_orgnica_definicion_corta.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/ignhiZn/widodunen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386365/normal_601f376673644.pdfIn PDF document text
    • http://xekalabaxuv.medianewsonline.com/history_of_broadcast_journalism.pdfIn PDF document text
    • http://samozanyat.info/955532718297vxy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476010/normal_5fd5f53406a3c.pdfIn PDF document text
    • https://cdn.sqhk.co/muzipajat/ifhgicT/3145160691.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/metabolismo_de_carbohidratos_y_lipidos.pdfIn PDF document text
    • http://debuged.mywebcommunity.org/basic_actuarial_mathematics.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/15094048902.pdfIn PDF document text
    • http://kebuwakuje.medianewsonline.com/94644690154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_60175ee7a2635.pdfIn PDF document text
    • http://changepass.online/6738958753564iwf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugazukadum.onlinewebshop.net/o_reilly_introduction_to_machine_learning_with_python.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_9ad40c3547384262a9f600fd6984a2d5.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_adcc79dc826f45259631459d34d0e8e7.pdf?index=trueIn PDF document text
    • http://satovimowenijor.myartsonline.com/acrobat_reader_dc_editor.pdfIn PDF document text
    • http://lebusepuwiri.atwebpages.com/noramubov.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_9fb638a0575b4255af6a0ab887a1e0f2.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_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 5416 bytes
SHA-256: ded0fa5b9bbfef688b453986b2a900c680690bbfbe4f0597c6e62304ee74e2e9
font_01_sfnt_off000102b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B4 10476 bytes
SHA-256: 463a65d18bfd5df1936d40b8133bd179f221f7568b83a7177f2378c241fb48ef