Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6685787173a809…

MALICIOUS

PDF

74.8 KB Created: 2021-04-08 05:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 05f2c1c27f9db4e5d5bedbf4609ce86c SHA-1: b1fa0ec1f0b09e68256687edba88c2db0b1bafe8 SHA-256: be6685787173a8097c7be72b2b2d9559a77df44466c287ef4c25aa5ccf622afd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/strik?utm_term=novation+launchkey+49+mkii+usb+keyboard+controller PDF link annotation
    • https://cdn.sqhk.co/peferitukofa/jgcBs20/triple_diamond_slots_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/7nxLjfv/parsecs_into_light_years_converter.pdfIn PDF document text
    • http://gepupovomuvota.iblogger.org/xirizowusewedaxumagisawed.pdfIn PDF document text
    • https://cdn.sqhk.co/nusuguponu/cjj6Fie/modern_history_book.pdfIn PDF document text
    • https://lopuvekire.weebly.com/uploads/1/3/0/8/130813144/wetediwevato.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/iPOjhje/7867390465.pdfIn PDF document text
    • https://cdn.sqhk.co/lakuziwi/7ja5hdU/the_kreator_ios.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/2b34e55c9484d.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/4jgdzWj/40977893620.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/bajapiwofevatikivo.pdfIn PDF document text
    • http://womufigi.epizy.com/ikea_kallax_shelf_instructions.pdfIn PDF document text
    • http://gezexibubaju.rf.gd/square_numbers_up_to_30.pdfIn PDF document text
    • http://kojokijekuwug.rf.gd/power_electronics_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/13297325704.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/puxovokoxujulujurukoji.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/xigimulukubelixab.pdfIn PDF document text
    • http://jutejuviwolopis.rf.gd/nabefexegovidologav.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_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 5760 bytes
SHA-256: 21ff272de1eab4c7790c0236310919bc1e86bd021e4e74ee02153099bd4ea86d
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 10812 bytes
SHA-256: a850993eb5b2d77b2ab33330ef7d4430a9207b7ee4ceac75f1ca67c79909b206

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