Malicious PDF — malware analysis report

Static analysis result for SHA-256 9829babf942d9eb9…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 02:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8036a6bb9af3b0ff4d4ab04ea750dbba SHA-1: b1ae59024fe6e756582fb159e3c15240c2f45873 SHA-256: 9829babf942d9eb91f0be8fcd624ae418497efdab93fdbcaab4e817622059a68
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'blank guitar sheet music pdf', likely intended to trick users into visiting the malicious URLs.

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
  • 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://yafferge.ru/award?keyword=blank+guitar+sheet+music+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4384640/normal_5fefec532ec6f.pdfIn PDF document text
    • http://lusolakidareve.mywebcommunity.org/6536012544.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498348/normal_5ff11650e188a.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/fanugexiwevejiburuzozu.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/18760671723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482863/normal_5fe192c6df848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_602a82697752f.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/hfJyKja/hearts_of_palm_noodles_whole_foods.pdfIn PDF document text
    • https://cdn.sqhk.co/kadukugobug/gdBhfgj/best_physics_puzzle_games_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406787/normal_60401a4fe33c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guxejusoselota.myartsonline.com/digeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7304ef83-56c2-4274-adc9-1821a7f34013/how_to_manage_conflict_interview_answer.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_14149e554d3149db88059a84e174907c.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_cb02bd092afc40069800674f87617c79.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_e6270d21720c4bb2978b2e6fa1365137.pdf?index=trueIn PDF document text
    • http://nisetekotixob.myartsonline.com/rodenabubez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf5e4b3-9c04-4e67-b02f-3d0b8f873369/by_the_waters_of_babylon_analyzing_setting.pdfIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_25211bdab94543b89ca99892bec3873f.pdf?index=trueIn PDF document text
    • https://2e96d104-cacc-4af9-914c-411927af6089.filesusr.com/ugd/0f866b_5c97d02f04434dadb0542c5f7af23148.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6843bf-3ecd-40f3-8a6d-540c09271432/wenupajosajoruxokanil.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_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 5684 bytes
SHA-256: 7c5883a918792c3c9752ea5e863a19924e9e94838ea9e118cd423dc11e7977b9
font_01_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 10748 bytes
SHA-256: 2e45c147d9155536bdfbbeb937ee642a17da4ba7d019e0ca7578d179ec95f9d8

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