Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f89b681b925a64e…

MALICIOUS

PDF

77.1 KB Created: 2021-05-14 08:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 314affbfc1f946429b1ca4f9a42665fd SHA-1: 72fdf21c2a9532a6a7e70e7413a83b2ad1fff8a7 SHA-256: 0f89b681b925a64e0e268d6fd65feb27fcef7315b7fc0a53c24fd7fe673cbb99
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting and acting as a link farm. The primary malicious URL identified is https://gimoguvi.ru/strik, which is likely used to redirect users to a phishing or malware distribution site. No scripts were extracted, but the PDF structure and embedded URIs strongly suggest a phishing or credential harvesting attempt.

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://gimoguvi.ru/strik?utm_term=2010+chevy+malibu+2.4+transmission+fluid+type PDF link annotation
    • http://pidagenavuziw.mywebcommunity.org/gujedalobezuxos.pdfIn PDF document text
    • https://cdn.sqhk.co/joraxeneli/gggfjjv/vubiveroleb.pdfIn PDF document text
    • https://cdn.sqhk.co/rovifatira/jcic6KS/10928954716.pdfIn PDF document text
    • http://xagixowedobosab.medianewsonline.com/what_is_cell_theory_explain.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/djdoge5/kung_fu_hustle_trailer_download.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/Lgjq5sz/28857651627.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/jcoijkD/angie_s_list_phone_number.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
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_edc915c179c44c8b9cef538c6c0bb457.pdf?index=trueIn PDF document text
    • http://vidoniwofunevan.onlinewebshop.net/evolution_agriculture_notes.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/download_software_to_word_pc.pdfIn PDF document text
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_5eceb9e841f24ec7864ff4b3cd9f04ca.pdf?index=trueIn PDF document text
    • http://kewetanetoza.atwebpages.com/laziroxejedag.pdfIn PDF document text
    • http://wodebupikeziv.epizy.com/friends_piano_sheet_music_letters.pdfIn PDF document text
    • http://sonogobujajeva.rf.gd/27069503590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5781ad5-f0d8-4e86-babb-40f20e4024f0/nozarovezoxorefevumutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/455f4488-9f97-4799-af97-b95feb1a2199/96208580306.pdfIn PDF document text
    • https://a62e46b8-d933-4087-892c-e5439cec6991.filesusr.com/ugd/e9cba9_faa244db34f84d31a14c9072f7ffd9b0.pdf?index=trueIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_96ad928237d64c08a2d000fb19c89f23.pdf?index=trueIn PDF document text
    • http://palelezugob.onlinewebshop.net/10854848870.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 5932 bytes
SHA-256: 2e6143fba107afb59ad32961400e819ebc1fffbee7b6ed26f7365597b645d5c5
font_01_sfnt_off0000f63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63B 10124 bytes
SHA-256: e8d03ef6a532194f14c63e24f01ef3a627a57065fee280ded51dd9e75f297e6a
font_02_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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