Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bca32d6f56791d8…

MALICIOUS

PDF

77.2 KB Created: 2021-03-10 01:10:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d7aa355d52bdaa8512825f4860f88902 SHA-1: b4bf250e7b5289dc223fc60cb3c0814a80788c36 SHA-256: 3bca32d6f56791d8ce1a0fa1cd32adc18b0dd2b47ee5e5868a20ed65e68d400f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links point to various domains, many of which are hosted on disposable or less reputable platforms, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to malicious websites.

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://jottigo.ru/award?keyword=coulomb+s+law+formula+pdf PDF link annotation
    • https://livesagu.weebly.com/uploads/1/3/1/4/131437401/df7a8dac.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/how_long_to_study_real_estate.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/AEoThcw/introduction_to_business_management_book.pdfIn PDF document text
    • https://zebomutob.weebly.com/uploads/1/3/2/6/132696512/jetudokexadedasajam.pdfIn PDF document text
    • https://degemojo.weebly.com/uploads/1/3/1/4/131407655/derim.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/2454410.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/maravillosos_desastre_saga.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/82523852740.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/sakajimutokirakol.pdfIn PDF document text
    • https://cdn.sqhk.co/wizokawoxo/bEheQji/riverside_driving_range_prices.pdfIn PDF document text
    • https://koduxiwarutuj.weebly.com/uploads/1/3/2/7/132740502/gekojupibakitevim.pdfIn PDF document text
    • https://povisegidugukab.weebly.com/uploads/1/3/1/8/131871963/1101887.pdfIn PDF document text
    • https://totuseki.weebly.com/uploads/1/3/5/3/135322554/fomikijatudi-xasafewife-makoregus-pubil.pdfIn PDF document text
    • https://gekofixesijivex.weebly.com/uploads/1/3/5/9/135961820/539eb9ebb84.pdfIn PDF document text
    • https://muboxofibadufus.weebly.com/uploads/1/3/4/3/134310828/6748331.pdfIn PDF document text
    • https://kusijavi.weebly.com/uploads/1/3/4/3/134385668/bbf49b0cc382db7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jezevenakos.myartsonline.com/fluke_t5_1000_vs_t6_1000.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/computer_graphics_principles_and_practice_in_c.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_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 5324 bytes
SHA-256: 469f5eee27927edc360380dee1cb8e8dbd0a6dbf66190894a10f60db4de490dd
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 10516 bytes
SHA-256: 0197ddafd43fe398f4772e57ae4b6b828f668b543902b75a5fde29f86d34ad64

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