Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc51622706023e42…

MALICIOUS

PDF

85.2 KB Created: 2021-03-11 06:10:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6ead41603517ead88184d2efd71702f5 SHA-1: fda9f4b12e0b17b8f758977e1191885bc78805b5 SHA-256: fc51622706023e4261f9065c7c295616ba4036aa38b5810a0185971ebcd43e57
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common tactic to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/wix?keyword=ultimate+guide+to+tarot+meanings PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368982/normal_60076dcc5a8eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476436/normal_5fe3a71b153ab.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/ARgdhjL/38264683205.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/0GggQic/xetugewukuxelegusu.pdfIn PDF document text
    • https://cdn.sqhk.co/fivodewile/a4gcXRe/zarudowodexopi.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/ghdghig/21534729876.pdfIn PDF document text
    • https://cdn.sqhk.co/difejekexe/0niisgg/dukufosumezeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469626/normal_5fd3bb1297994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_6035cadb3df91.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/jdFiahi/53107185380.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/vgiM3jf/cheap_return_flights_to_san_francisco_from_london.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/hjiejeu/rojiponikejibokeve.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
    • https://s3.amazonaws.com/mubemutolewe/vs_code_sql_formatting.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_c88b1f7e30414037a9e7646c7ae63caf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/how_to_read_lumbar_spine_mri_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d66cf44-429d-4db9-b67d-cbbaf53767ef/how_to_tell_how_many_cubic_feet_your_refrigerator_is.pdfIn PDF document text
    • https://28487699-8e1b-430a-a1d4-fe6adda630b1.filesusr.com/ugd/79e5df_6613e2daa52946ae9bebdc36537406a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/mibelibin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee8b576-579c-4a78-92c0-e43dbc35468f/vujorasi.pdfIn PDF document text
    • https://327bbe42-9aa5-4ca0-80e5-6c9857058a26.filesusr.com/ugd/2b870b_537fabc6fbe84de8b3fa7d0b78532168.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001026c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026C 5020 bytes
SHA-256: 85d9c4fbbb57e4cb577d706a536c988ff1997c10b756869f8e592555b78d9da4
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 11104 bytes
SHA-256: ff96474b643e268194c20729baa15d5513dc038d827f99c8ed0550e42b1515fa
font_02_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2