Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af1d5200a23f6ba…

MALICIOUS

PDF

80.9 KB Created: 2021-05-08 21:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e478368432bc98f2638a76e385fd259e SHA-1: 647180079768e5ca9be12ae6634259ba9010265c SHA-256: 1af1d5200a23f6bafeca56312faeac1c81bbc92ff0426c8acee05f12d8314917
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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 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://soxebez.ru/strik?utm_term=bose+universal+remote+control+app PDF link annotation
    • http://wovugikanagak.scienceontheweb.net/abdomen_agudo_pediatria.pdfIn PDF document text
    • http://judupebe.getenjoyment.net/generalized_implicature.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_6057131c51da7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_6031205327fff.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/dell_latitude_e6540_usb_ports.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://trastenmyqort.online/reforma_educativa_20168rboy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474978/normal_603b494d9b28c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488556/normal_601fada78ea16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_5fdbe9ffef13f.pdfIn PDF document text
    • http://armada.technology/60969999541smop2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392877/normal_5fe26d0dc68be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_600d351a0c8ce.pdfIn PDF document text
    • http://fionainthefield.org/vexesalevugu0zk4j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_601c6aabaec89.pdfIn PDF document text
    • http://itfamily.pro/zozikejuxamelig1tkm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_602f619a01964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_6059b37e1ff1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_6009d9c5605f8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zipanigav.epizy.com/walulotujotexim.pdfIn PDF document text
    • http://xewojof.rf.gd/53213995731.pdfIn PDF document text
    • http://sulenovigadi.myartsonline.com/fisco_agenda_2020_descargar_gratis.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_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 5188 bytes
SHA-256: ed2659c02fd876bacdbdce3f7cce418fbc420b3f41c6f8fd043c442fad7de370
font_01_sfnt_off00011000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11000 11216 bytes
SHA-256: 2cc5ef11fdcb205be283b0d79db2ff421622f156c9085613d53f8a9841e1598c

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