Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb45fa917b766c2b…

MALICIOUS

PDF

115.4 KB Created: 2021-03-17 04:07:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 78cebc2955578ff6bc763f3394916f41 SHA-1: b18d7214670828788fbe56bbb272517a2e8dd917 SHA-256: fb45fa917b766c2ba49740926dd74c3c0d73488bcc0dced7da66e8d7e846fe77
186 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, indicating a link farm or phishing lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further payload delivery.

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://seumenha.ru/award?keyword=capacity+building+meaning+pdf PDF link annotation
    • https://cdn.sqhk.co/mewixamok/sggYjfC/agenda_escolar_mandalas_2018.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/famabi.pdfIn PDF document text
    • http://vir-tus.com/19510418000r7f34.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/iiRPahi/77895484674.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/qhbieih/52554340051.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/dBUuXih/fegujo.pdfIn PDF document text
    • https://cdn.sqhk.co/moserusoba/vhhjPhf/ria_sending_money_online.pdfIn PDF document text
    • https://romasagato.weebly.com/uploads/1/3/4/7/134723475/314b782423.pdfIn PDF document text
    • https://nibawisid.weebly.com/uploads/1/3/1/0/131071209/tubeguxivab.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/dCfFc9n/navenub.pdfIn PDF document text
    • http://ehaberdevlet.com/653008635165fcm8.pdfIn PDF document text
    • https://cdn.sqhk.co/kovajivika/jVgdhhn/foped.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/gjfji7B/dop_draw_one_part_level_178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_d8a5a65fa3194fc1b761198e651d3e0a.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_ea3d6d9b8eea4ea0a46ed91f36d89968.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_93ff1454e7fa467f9965e96ae2af418c.pdf?index=trueIn PDF document text
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_087014c26ce746eeb765ed8d1d70e9b3.pdf?index=trueIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_ccd0b02242964436ac86133ab1bc7dfa.pdf?index=trueIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_0cc0ef6f9147457f9dfd327e51a9b537.pdf?index=trueIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_db4cd60486e5455fb8fa06de18c9ad8d.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_off000185aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185AA 5348 bytes
SHA-256: dd76dfbc4fc5a1212de1a590a23a07650d565c64514b481cf893ce78b2b09f5e
font_01_sfnt_off000197cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197CF 12124 bytes
SHA-256: 28f58e41a05e1e3bc4287e12d9ce78a746d161e80ae88543bd0eb15940a954b8

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