Malicious PDF — malware analysis report

Static analysis result for SHA-256 7739845d77e4d25e…

MALICIOUS

PDF

67.9 KB Created: 2021-04-12 16:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ae2f68c77f1544814a3baa22ea6e1e8d SHA-1: c19f3753b88cfeaddf3b5ac889d6d98bf667a5dc SHA-256: 7739845d77e4d25eb111af6b21b4af735b8a99f9ae27b295a732643b07c92f43
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 pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://jacksth.ru/strik?utm_term=1989+ezgo+marathon+rear+seat PDF link annotation
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/270b38.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/7186422.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/2107981.pdfIn PDF document text
    • http://noksipals.online/rt-n66u_recovery_mode7jvb7.pdfIn PDF document text
    • http://easycreditscore.info/beretta_92fs_compact_shoulder_holsteryx03m.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/fb618468-4dd8-4ced-8831-3002469d8d8f/luzoziwunofipul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971dc9f9-2ec3-4280-9207-9e9fc160d293/zowufinakipudegevubozusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46adccbe-2780-4ca9-b8bc-00060a0c015e/59736947226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7028b35e-6130-4197-bb2b-a0a445e0de60/woputavizopawiragikusum.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_218ccd055ddd4b629c97a19bab7a0768.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_fb8635153cdd48d296fd1966301c1042.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/revaz.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/mebudedekajufutuninuro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ce3546-c6a1-4880-9d28-3ecfde23139a/el_viaje_de_su_vida_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5612d502-86ba-4f24-b70b-5a1ef8325041/kisotawopigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6b39331-191f-43b5-b3d5-8f4a19b817a7/61316242526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93e57d2-486e-4185-a06b-39e0d8471029/their_eyes_were_watching_god_book_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67007120-4c54-46d3-96a1-3b2bc6841fc9/naxukefux.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_off0000cbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD2 5424 bytes
SHA-256: 5fcb2ea58e36b0186a6a3ab30809afa239b3c376cd1c73195236a3f4dce3e611
font_01_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 10532 bytes
SHA-256: e2e0d0d266531e07f717d9cd29ba3c91db6c2e2cb4c36ec8be59db5a45b2ab4a

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