Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1eb4613e643b412…

MALICIOUS

PDF

143.8 KB Created: 2021-05-22 19:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 881ae6963748f37ec3461d5379a25869 SHA-1: 7334d0977850fcf3f5b996b3b687013b445fce3f SHA-256: d1eb4613e643b41254f57f688fcc0dea9f08948241a0f4e29008978984aa05b0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The document contains numerous external links, with a primary suspicious URL pointing to a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of many external links suggest it's designed to redirect users to potentially malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=ejemplos+de+ensayos+literarios+cortos+con+autor
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5fecc2e0488f8.pdf
    • https://baxojozejaxofo.weebly.com/uploads/1/3/4/5/134586757/kojemuriwirere.pdf
    • https://cdn-cms.f-static.net/uploads/4416149/normal_604654b73c867.pdf
    • https://jokanile.weebly.com/uploads/1/3/5/9/135962808/ed67e2b0c.pdf
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6044cffa536ec.pdf
    • https://fulojozizarotuv.weebly.com/uploads/1/3/4/3/134318677/2152834.pdf
    • https://nidapekosoko.weebly.com/uploads/1/3/2/7/132740606/gekumixagafe-wepapizom-rojud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8042f8ab-925b-4117-b91a-ff15b99043fa/45859064311.pdf
    • https://uploads.strikinglycdn.com/files/8c9202d7-ca35-4caf-803b-688dbe4a6f6c/savopajoxetisozulagedasun.pdf
    • https://uploads.strikinglycdn.com/files/bf38ae6d-5055-4947-b46b-cdca2930b69f/mitologia_griega_dioses_inframundo.pdf
    • https://s3.amazonaws.com/zomuzigo/baasha_tamil_film_song.pdf
    • https://s3.amazonaws.com/lewuli/burudifag.pdf
    • https://s3.amazonaws.com/jasipefulaxiduj/media_player_update_for_windows_7.pdf
    • https://s3.amazonaws.com/jefobexapulow/auto_clicker_android_no_root_2018.pdf
    • https://uploads.strikinglycdn.com/files/667b483b-4c55-43c6-adad-a25a0fd141a7/gulevuv.pdf
    • https://s3.amazonaws.com/lanaladu/read_dc_comics_online_free.pdf
    • https://uploads.strikinglycdn.com/files/3030e6a9-1b30-4d7f-b2ea-f5fd0e4a35aa/befaxoz.pdf
    • https://uploads.strikinglycdn.com/files/96b90b5b-a17b-406d-bfb2-665c1740f827/33305272239.pdf
    • https://uploads.strikinglycdn.com/files/4b782cbc-60a7-47f6-b669-16b702b59608/which_engineering_is_best_in_uk.pdf
    • https://s3.amazonaws.com/dejolavubukugeb/naruto_games_free_for_windows_7.pdf
    • https://s3.amazonaws.com/paropabaru/patojazavivoju.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_off0001f6bb.bin
d7a85a494dcd719e739e42513ee4e0c60e2fd35f7c6dd6658c754607e7a4f08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6BB 5356 bytes
font_01_sfnt_off000208e3.bin
e647629c7fa35c3b0f610761653017713e6028fe558c8876b82e3a4086e16e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x208E3 11940 bytes

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