Malicious PDF — malware analysis report

Static analysis result for SHA-256 7154f4523c6f91bc…

MALICIOUS

PDF

84.4 KB Created: 2021-03-17 00:54:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9cd9ad389cba46ebf4e820465028f537 SHA-1: 22d6f5d46dbcae9e3137841322308aa09cd463fa SHA-256: 7154f4523c6f91bc93d97f4a032956829d8eb267791b1cdbda6f854555cc5a8d
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirector pattern, likely leveraging T1059.007 if active content were present, and T1566.001 for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=formal+business+letter+template+pdf In PDF document text
    • http://pimovanurebi.22web.org/baaghi_songs_video_mp4.pdfIn PDF document text
    • http://dowelatevitik.22web.org/new_auditor_s_report_effective_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419410/normal_5fe5e868740ec.pdfIn PDF document text
    • http://zabolojisag.getenjoyment.net/palovowejobadupuzadegopu.pdfIn PDF document text
    • http://vazolixamitom.22web.org/sadurizokixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476947/normal_6037db83566c5.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/Rigjifn/xikutaxofi.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/cbGVwb6/97045953254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_6032faf0b8a07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5ff4a94ab25df.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/chcXkIS/republique_democratique_definition_juridique.pdfIn PDF document text
    • https://cdn.sqhk.co/sirobuse/Fqjggf0/mow_zombies_apk_obb.pdfIn PDF document text
    • https://cdn.sqhk.co/boremagu/csVIpge/43277903847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizoli/38789436637.pdfIn PDF document text
    • http://kusababi.onlinewebshop.net/voiced_and_voiceless_sounds_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/90996063287.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/taobao_singapore_shipping_guide.pdfIn PDF document text
    • http://jinonepi.epizy.com/reinforced_concrete_design_handbook_as3600.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_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 5280 bytes
SHA-256: 6d58cfbfa6c401d408efc321f00b5b5cfaeed48b06eb204f4030453e6c4f5465
font_01_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 11312 bytes
SHA-256: 795000a88789a5e4e94fa9a5838414d2b271ce21edb28fe09ba95919db5af5c2

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