Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b8a8625a3a1b42…

MALICIOUS

PDF

77.0 KB Created: 2021-06-01 04:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00dcf2a91f3a976cf6de89696ef368d9 SHA-1: a2217beb1e1f039d861dfa8afca86415edf2cd19 SHA-256: 51b8a8625a3a1b428b37c0e37a12865ba9ebd6afd5290d1d76d4cb24c4920caf
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'gimoguvi.ru', suggesting a phishing or redirection attempt. The PDF structure and embedded content are consistent with a lure to a malicious website, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/wb?keyword=1996%20viking%20pop%20up%20camper%20owners%20manual PDF link annotation
    • https://nudirekuv.weebly.com/uploads/1/3/4/7/134716663/kubimidusutuvo.pdfIn PDF document text
    • https://kozuliwibiji.weebly.com/uploads/1/3/4/7/134705154/4527cfe5149fa5.pdfIn PDF document text
    • https://fetoviwenibade.weebly.com/uploads/1/3/4/7/134701039/9dc6689ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5fdb19f58bb14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393018/normal_5ff7732cd72e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_605f39972bbfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460465/normal_60460b27c7a5e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417830/normal_60b06645d0dc5.pdfIn PDF document text
    • https://warubeduzubam.weebly.com/uploads/1/3/5/2/135298611/7804476.pdfIn PDF document text
    • https://xumipapabof.weebly.com/uploads/1/3/4/6/134609146/0e3033635946cb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_6014c7a5444d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_600cdf6144050.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/332e85cd-fc22-4cee-a16f-b45d6e74494f/julukemugi.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144439713/how_to_measure_megger_test.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144412557/download_driver_amd_radeon_hd_6400m_series_hp.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/xipimifukidedar.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144438543/56981623970.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/74793448507.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144416241/fanala.pdfIn PDF document text
    • http://mukonisu.pbworks.com/f/fortnite_mod_apk_unlimited_v_bucks_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc3eb69-b7ce-469c-a108-a4d036907f01/installation_adoucisseur_fleck_5600_sxt.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/72937856302.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/lezuxabisifoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c5275fb-85ed-4402-a063-c4174f3493b2/10360290085.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_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 5736 bytes
SHA-256: 2b699308a280b7c9a2357b215cf1b4ae5e5d8efc82c8d02c0b6dc6c028e04b6d
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 10992 bytes
SHA-256: 0a66b6d0a5c671fae62df32689693ddc430dae5bbdf0255c968215cfc37dc6d6

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