Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd449efc95367a9…

MALICIOUS

PDF

85.6 KB Created: 2021-03-20 19:47:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0419a7f5e5eeee5c02fcc2cb3654b1bf SHA-1: 6911e9f0c0883aaa9844063ed87746d3a58a14ee SHA-256: 3dd449efc95367a9120f98129240c23275acb2800a46d92528778b94570cf6d4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to disposable domains and hosted on services like Weebly and sqhk.co. This behavior is characteristic of SEO spam or phishing campaigns designed to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cdn.sqhk.co/nadizolobe/jcBhfNZ/bubble_star_plus.pdf In PDF document text
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/nulixuzor_gijofaluvesile.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/Jriggf7/8079748828.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/31329777752.pdfIn PDF document text
    • http://gobomegom.22web.org/99573577936.pdfIn PDF document text
    • https://boliwarabinobe.weebly.com/uploads/1/3/1/4/131437394/e5ba5630ce99.pdfIn PDF document text
    • http://lianhua.life/what_is_the_summary_of_oedipus_rex_storyjtist.pdfIn PDF document text
    • http://wazadewiketepa.22web.org/prostate_bed_contouring_guidelines.pdfIn PDF document text
    • http://donbetosstreettacos.com/who_carries_kenmore_dryer_partsr72oa.pdfIn PDF document text
    • http://luziniwanemek.sportsontheweb.net/fonetodudiwadew.pdfIn PDF document text
    • https://cdn.sqhk.co/dapubebireba/haLifhb/modular_construction_of_nuclear_power_plants.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/BxihXij/35418564449.pdfIn PDF document text
    • http://buyfastedcircle.xyz/rikokodegoxenefideminu4fiq9.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/eFyjf1W/starlink_launches_may_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/xgghbgd/55310090970.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/84944988857.pdfIn PDF document text
    • http://butalinonoruma.scienceontheweb.net/febadejapurib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=intl%20business%20machines%20stockPDF link annotation
    • http://napubuxuwel.epizy.com/kuluweguwekikomom.pdfIn PDF document text
    • http://dalumawinalejat.epizy.com/1st_grade_common_core_math_printable_worksheets.pdfIn PDF document text
    • http://kidoputuf.epizy.com/dawoxafigurisogus.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/43282025872.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 4964 bytes
SHA-256: 701fdb1472e95b880a3924f2e649544348d51e26bfde7f2dc437f7d9e8f2a0c4
font_01_sfnt_off000110a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A5 13560 bytes
SHA-256: 6594087541d68077ef23afca512c632fb02f524ffe4d1d6aaaf8221a36c29524
font_02_sfnt_off00013af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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