Malicious PDF — malware analysis report

Static analysis result for SHA-256 549013c09ad176cc…

MALICIOUS

PDF

71.9 KB Created: 2020-11-22 17:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a59a5635778acbc763ef3877f63699dc SHA-1: 7e8bde87f423fd91a305bcb4986d46aa46ccb9d3 SHA-256: 549013c09ad176cc13bd1c0433a00f23814ea7e9d8f27f899c29f09e022ecaf8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO poisoning attack. One of the external links, https://trafftec.ru/123?utm_term=enchanted+lake+elementary+wix, is flagged as unknown reputation, indicating a potential malicious destination. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/123?utm_term=enchanted+lake+elementary+wix PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385021/normal_5f931ee5539cc.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/5b8bf3948c1e.pdfIn PDF document text
    • https://gorokawuse.weebly.com/uploads/1/3/4/4/134489158/5560289.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/weitere_informationen_englisch.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/61724264607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ab4f1e-00c4-4cc8-9639-00f66b628b01/61103991425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8a7941-b88c-4960-a925-41646a286f8a/rudasenudijomete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66fab035-e250-4a97-b53a-932e6da30b4d/pagikelejafefejeloxod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c44cbf8-d49a-47b3-97a1-c9c00c27dd89/balancing_act_worksheet_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c4e691-ab8c-41ec-aa8d-255603e240e7/veneximukalinuxup.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/best_torrenting_sites_2020_quora.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74F 5284 bytes
SHA-256: 845fd3b4fc1eb6152222d4a6b82006abc3b9d3a7ab00118abe4d2a6aa02a51a3
font_01_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 10880 bytes
SHA-256: 94c9424258e246f48fd13e579e2671cd5a1bb0c5e444225533bd5ceb275f391c
font_02_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 16068 bytes
SHA-256: b09879be15c6eb2246ae7b48c1c275502bdacda3194b2e7a150da035b49823e9

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