Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb65c79177bb82fe…

MALICIOUS

PDF

71.2 KB Created: 2021-02-02 19:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f1e6add777e184d20a46ee07461890dd SHA-1: dd4685792a9c567029cdf4a08f373bd69288680d SHA-256: fb65c79177bb82fee2ecf1a7d86ca4b8c9ef49fe4e2cdca39d7bfaa43ea17f5c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and the ML classification strongly suggest malicious intent, likely to redirect users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/aws?utm_term=ardent+leisure+annual+report+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501514/normal_600d9a0a91f2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411219/normal_5fec75c3ee7aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490250/normal_5fe2a66e9de58.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/dauntless_game_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5fdea76412ed6.pdfIn PDF document text
    • http://tozufokoxogo.22web.org/sopukatekowibatejazi.pdfIn PDF document text
    • http://shopyou.online/o_come_o_come_emmanuel_piano_guys_cecb8yp.pdfIn PDF document text
    • http://wofijolusiga.iblogger.org/a_n_c_songs.pdfIn PDF document text
    • http://arevakar-travel.com/sopoxazaat.pdfIn PDF document text
    • http://alteramaks.world/genesis_v2100_bike_manual68rq5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_600cf5aabb78a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xorisok.epizy.com/juvivo.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/report_about_bhaktapur_durbar_square.pdfIn PDF document text
    • http://lunijikujapike.epizy.com/android._app._activity_vs_appcompatactivity.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/report_road_accident_online.pdfIn PDF document text
    • http://gerosopidazab.rf.gd/face_mask_sheet_for_acne.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/boer_goat_farming_manual.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_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 5464 bytes
SHA-256: c279777e16885115cd688f4dd33ab6a0bdcf429792f715b50e6814af7f41a657
font_01_sfnt_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 11432 bytes
SHA-256: e1eebe1863dd64fe45153204481491fa16c6526a9d5822a464bbc9c9c1725d69

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