Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46b1c1cf2e41e83…

MALICIOUS

PDF

77.4 KB Created: 2021-06-10 10:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f0a3763a0cc46ebea5b0d3636ced4d67 SHA-1: dc5d50d9893e41e34fc80985c397c359c1300476 SHA-256: c46b1c1cf2e41e83c2a0b9fd885eaf5bf3c4df49b44195985548cc923fd34f65
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains multiple embedded URLs, with a primary suspicious URL being https://baarspo.ru/123?utm_term=anemia+pdf+slideshare, suggesting a lure to a malicious site. The PDF structure and embedded links indicate it functions as a link farm, likely to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/123?utm_term=anemia+pdf+slideshare PDF link annotation
    • https://dixonojobu.weebly.com/uploads/1/3/3/9/133997274/469db4652d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476758/normal_6021f6573c6e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418764/normal_606987e2b1f80.pdfIn PDF document text
    • https://loxojugeg.weebly.com/uploads/1/3/4/5/134589710/fusujem-rutupek-dojukojokopepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446496/normal_5fffc4b560635.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_6065978888569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368997/normal_5ff92721da1f4.pdfIn PDF document text
    • https://ziwarafe.weebly.com/uploads/1/3/4/3/134306838/tewuluxude_radoj_zomuduxokofele_jofaso.pdfIn PDF document text
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/6422425.pdfIn PDF document text
    • https://wepujemu.weebly.com/uploads/1/3/1/4/131453456/3001782.pdfIn PDF document text
    • https://rezepurobej.weebly.com/uploads/1/3/5/3/135327696/cbae5ed46d98.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gejigavowule.pbworks.com/w/file/fetch/144714270/basic_english_sentences_for_beginners.pdfIn PDF document text
    • http://nijominem.pbworks.com/w/file/fetch/144995742/wave_editor_pro_apk_cracked.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/f/turbo_prepaid_card_free_atm.pdfIn PDF document text
    • http://xefobukeza.pbworks.com/f/dileloseribezusogugezewot.pdfIn PDF document text
    • http://jijagenaneke.pbworks.com/f/fawovorasededi.pdfIn PDF document text
    • http://vuxoris.pbworks.com/f/advanced_water_treatment_technologies.pdfIn PDF document text
    • http://tagiruxot.pbworks.com/w/file/fetch/144930786/shatta_wale_ft_shatta_michy_low_tempo_mp3_download.pdfIn PDF document text
    • http://tonavaf.pbworks.com/f/auto_clicker_for_piggy_roblox.pdfIn PDF document text
    • http://xozojonurom.pbworks.com/w/file/fetch/144610830/don_stevens_minneapolis_mn.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 4868 bytes
SHA-256: e3acd96c1812ef932da2941f2a0b3752c38986647cf42061d985fbc9fcec08c5
font_01_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 10548 bytes
SHA-256: 94acd7cd5249b59fb4bd965db673cb811ae0828604002ae4ee5c7746ab7f8d5e
font_02_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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