Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa080d5f4a323171…

MALICIOUS

PDF

79.0 KB Created: 2021-04-09 18:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 506f7fabc1738fded8f46c4ec05a00b2 SHA-1: 48bd611bcf6a0ac9c984e8a69a5a4c1dc7acdac9 SHA-256: aa080d5f4a323171f6fda9c9d6cfad4ae0c312730d48de2d4bee2523fb331078
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=jorge+bucay+cuento+de+amor PDF link annotation
    • http://zagodutaf.getenjoyment.net/pifidezinin.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/KijJigE/surviv._io_hacks_august_2020.pdfIn PDF document text
    • http://duwelizub.mywebcommunity.org/cognitive_behaviour_therapy_book.pdfIn PDF document text
    • https://cdn.sqhk.co/wepiwojeta/hdKcxhf/school_management_system_project_documentation._doc.pdfIn PDF document text
    • http://kvrovk.xyz/yiruma_sheet_music_maybe46scp.pdfIn PDF document text
    • https://cdn.sqhk.co/filodomazora/hjdidD3/88168559753.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/2wi9jcH/bloons_tower_defense_6_hacked_download.pdfIn PDF document text
    • http://klokisik.space/spina_bifida_types_meningoceleqxmwn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_3430d42b84044996ae209ceded699348.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/3221213515.pdfIn PDF document text
    • http://setovoj.onlinewebshop.net/8278867321.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/14882456288.pdfIn PDF document text
    • https://0d801636-e20c-47cf-9654-f2c4f0d28fb9.filesusr.com/ugd/2e7c9c_9d498c1b7f474593b21be1e7986d5261.pdf?index=trueIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_d911ed32c85441dd987be4531c8729db.pdf?index=trueIn PDF document text
    • https://b7c0b8aa-2746-4b81-86ab-4dfcec723e12.filesusr.com/ugd/383078_3bae2ee79df9498c898968c78835bfbb.pdf?index=trueIn PDF document text
    • https://34a711a6-6b77-41b4-a6d5-f55437226814.filesusr.com/ugd/c1ce8b_2023983f95ef48e681387269e2621421.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_off0000f7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AA 5280 bytes
SHA-256: 6a844bf310b1de04ef5835f3bdb2e40bec8d653b2c4699f250d19f5aeca965eb
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 11692 bytes
SHA-256: 5f40c3f855cc3e39c304b07d929d00cef37df48e3acd0cb2413b624308e5b485

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