Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a37b55ed3a823fb…

MALICIOUS

PDF

75.0 KB Created: 2021-03-20 02:39:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: db8d0be8ec6782ef34155e0e030acd21 SHA-1: d5a46f17e3007405797f89fa13de9ed80dff91c3 SHA-256: 9a37b55ed3a823fbed334b79713a363927e256683b0abb7effc394e57e0dff4c
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, flagged as a link farm designed for SEO manipulation or potentially phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious or deceptive content, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/123?utm_term=angularjs+form+invalid PDF link annotation
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/sogazozefitenux_xixuviwi_nibunolafib_vadane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_604f405faa8ed.pdfIn PDF document text
    • https://bumesusibob.weebly.com/uploads/1/3/1/8/131857970/toselatete-fupamidafutiv-mopilemijap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_60007a02042d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_6051e4f6e1229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_603ccaf706563.pdfIn PDF document text
    • https://tedetoxemerul.weebly.com/uploads/1/3/5/3/135311624/4553460.pdfIn PDF document text
    • https://pegupirorig.weebly.com/uploads/1/3/1/4/131406852/zadibomo_xofawesano_rigitadokig_gerajiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470545/normal_60403ba352b44.pdfIn PDF document text
    • http://ropewelopison.iblogger.org/logeruvodopufi.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/jazigufinimadawitu.pdfIn PDF document text
    • http://wivafojoki.22web.org/kaxavipe.pdfIn PDF document text
    • https://podozipejubepa.weebly.com/uploads/1/3/4/8/134893890/ac415339c9e7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e82751-113d-49a1-a021-4d07d8730609/zumuzakenozebasik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d18a61-9781-4269-b93b-97fc927c1348/sogipilaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c82176-ff75-469b-8cdd-a6b4e069e5b8/89967726619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f1aa51a-d740-480e-b609-8db9a8a9461f/virgil_aeneid_mandelbaum_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47eb4c7f-d70b-480d-978e-17942f522621/jetujiterabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb9b3143-5ad2-4a2b-a461-66072120f7f7/what_effect_will_boiling_have_on_an_enzymes_activity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/affd8532-0d83-42af-a9c4-8aa0d65efd59/scid_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5be358f5-1866-4634-8b5d-1f54c181476d/wood_cutter_machine_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14579040-1abf-4c57-96c1-39c04d195453/blank_venn_diagram_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a41df7c-b75f-458f-977f-9e5d65511759/gavanejilez.pdfIn PDF document text
    • http://jezawirigi.epizy.com/91692181173.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_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 5352 bytes
SHA-256: 5baa5289e78b7108fcec01af58bacf0c916df083f071f653d15a7d07601b4ee4
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10908 bytes
SHA-256: 1c8200371b741d19e39fd9dd35de797577f23212907e09165f9f25b9fd7ee7b2