Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6c19e14d30ce45…

MALICIOUS

PDF

75.5 KB Created: 2021-03-30 00:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8f2e485720e07f5f98d53d620d1cb287 SHA-1: c029a23a7f4f1ebcc44ca50f03a082499a6df08a SHA-256: 8e6c19e14d30ce45254f50822c89a8e22b8891c8e51b7c4549ae33db17ab1c76
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though truncated and containing artifacts, mentions "Piano sheet music maker", likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/123?utm_term=piano+sheet+music+maker PDF link annotation
    • https://cdn.sqhk.co/figoveraboj/ejdqqDc/7_words_to_describe_yourself.pdfIn PDF document text
    • http://rifijetuvijilam.medianewsonline.com/integral_calculus_example_problems.pdfIn PDF document text
    • https://mokufomaduw.weebly.com/uploads/1/3/4/6/134600220/gimubamefekifex.pdfIn PDF document text
    • http://biolinkus.me/can_i_check_a_lottery_scratch_tickets_online0xy8h.pdfIn PDF document text
    • https://tolakuvekefub.weebly.com/uploads/1/3/5/2/135296469/bfbf57396.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/UibAeha/22142603019.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/hal4das/dogfight_1942_xbox_360_download.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/dKvKbji/that_s_disrespectful_to_you_meme.pdfIn PDF document text
    • http://tizadejaso.getenjoyment.net/30488863690.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/79164793455.pdfIn PDF document text
    • http://verifybadgesbusiness.com/yahtzee_score_sheets_near_memc73b.pdfIn PDF document text
    • https://cdn.sqhk.co/tugitajusow/giiagjU/face_mask_required_in_texas_sign_printable.pdfIn PDF document text
    • https://xubejuvanexog.weebly.com/uploads/1/3/5/3/135311054/6809754.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/bLuhjje/aliens_drive_me_crazy_game.pdfIn PDF document text
    • http://bighome.space/chapter_6_section_3_the_enlightenment_spreadsap39b.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/naxigexiweni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_8cb41685a28d44de9bdd163a661196f0.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a9c80b566add4e468a45ceb0d136c2d6.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_9dd5bf8d84d9463e8736a0ce3a7d06cf.pdf?index=trueIn 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_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 5072 bytes
SHA-256: bf523a0719c4a6576f98c9cac2eef3a1ef8671671f05f7b29790542019cf00bc
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10704 bytes
SHA-256: 8a5e9089dba87690057e4e1e99a441ce158ec9812ff9373bc26eb54cc13106e6

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