Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ae9748b203810c…

MALICIOUS

PDF

89.9 KB Created: 2021-04-12 12:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7bc5c672f82b955cac228bf96b921eed SHA-1: 255b6b1cc145c9a78bd7b0335928861b8a18333b SHA-256: 46ae9748b203810c92802429ce4e0714043d418f5bb5e7409d429483d79de376
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm hosted on disposable domains, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/strik?utm_term=mathematical+logic+questions+and+answers+pdf+12th PDF link annotation
    • https://cdn.sqhk.co/midijanere/jgr2igZ/monthly_games_ps_plus_november.pdfIn PDF document text
    • http://insuranceautousa.com/batoka1i0uw.pdfIn PDF document text
    • http://smm-target.ru/mabexegalotofuwagezipiluxc52jd.pdfIn PDF document text
    • http://nesobaka9.xyz/bullet_smoothie_maker_amazont52n6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_601469f432e5d.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/2fjdugc/candomble_religion.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemonuru/cQCihud/tx_parent_connect_hisd.pdfIn PDF document text
    • http://karaulovlife.site/wovezapevuduxevek6cm2t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5ffc2c7bd02d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404739/normal_605585f87a3d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/963f8d3b-d8f7-43ae-bd5a-5f7d79dfed2d/folegumikawemis.pdfIn PDF document text
    • https://4694dce0-4d1e-4c77-b4da-d1f025f82355.filesusr.com/ugd/fb332b_8ab2137b58724879a83fd31774a4e79e.pdf?index=trueIn PDF document text
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_87deb35c37bc49f88c02edf68e3148ea.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_685b593a0079476dbf7a3c9ab65195fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d78178c0-2d31-427a-9c78-b8686aa7eed2/resumen_de_romeo_y_julieta_personajes_principales.pdfIn PDF document text
    • https://cb71deac-5427-4a11-aec2-6feec017c243.filesusr.com/ugd/4cd983_5c34f80f6cfc4c8982b3fa3bb237c5cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08b9059-b7f3-40d5-9ad9-46e4bddaa0ba/craftsman_riding_lawn_mower_parts_diagram.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_ed235e9753e04f55b51c6d8d4fcb81cd.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_6b93c39e29ed4010a4af5813bd86e44a.pdf?index=trueIn PDF document text
    • https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_8a8ddecb399a4a76a17e1f6d5decf5ce.pdf?index=trueIn PDF document text
    • https://ee67c5b3-b4d3-4257-b425-af55881d3a68.filesusr.com/ugd/c60da7_fd2600ba756c44b5a2300d0f0785351e.pdf?index=trueIn PDF document text
    • https://5b5cf7c4-d983-4e27-bd54-44d52fc9074e.filesusr.com/ugd/2f9450_742029d6368e4080b0a9a46dc5299914.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d458cc1b-1b65-4fed-aab4-56ead37fc219/prayers_that_avail_much_protection_for_travel.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_50e0447719064f41b1ce6d68c41a2fdf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 5976 bytes
SHA-256: 9211a6ddf683a46b116e59948c76bc1ba2a22212c84e90f5eb92ac19813190e1
font_01_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 11872 bytes
SHA-256: da9473913bd85878645dc2527423808212da1ca05ddf59ad7ce72cb99c2322f5
font_02_sfnt_off00013f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F09 17564 bytes
SHA-256: aee742b207a709e5e4fdd0650f88b30b4b188abd9679f259dbc18a0a965acfb9

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