Malicious PDF — malware analysis report

Static analysis result for SHA-256 081f396e20f88e76…

MALICIOUS

PDF

73.4 KB Created: 2020-11-24 07:36:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7a86c82764911f75db7b5f08df55c828 SHA-1: 61161e7cd1c62b5588b0e2e542307eef2ae2e227 SHA-256: 081f396e20f88e76655c275c223befd6ea6ac14d22eebf25edbe01a6a33e3d11
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The embedded content, though heavily obfuscated, likely contains JavaScript to facilitate these redirects.

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://trafffe.ru/strik?utm_term=je+%25C4%258D%25C3%25ADnske+jedlo+dobr%25C3%25A9 PDF link annotation
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/nadisiwom-xopanesewidimex-xiwetusev-fupemu.pdfIn PDF document text
    • https://rujapunilibufig.weebly.com/uploads/1/3/4/7/134713438/3950740.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/663f7b7b1d3d.pdfIn PDF document text
    • https://gokododilu.weebly.com/uploads/1/3/4/5/134578034/tulizogeviberosun.pdfIn PDF document text
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/4500604.pdfIn PDF document text
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/kedujanakomi.pdfIn PDF document text
    • https://neliwoxe.weebly.com/uploads/1/3/4/8/134871618/9364997.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/44e2e7ad-7237-4af6-aaf1-ada4bc93d915/52136846800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/911e9188-6a37-4b3d-9622-e39e9d165920/raludagefamenefufisos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a10e34-a96f-440c-bda6-bca529cd51c8/rasebesarulun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f3577bb-cb25-4e7c-b058-23c22687d935/laxarudadawapubaso.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/damalipekutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd4e0e95-0d0e-4ae2-932c-f7f520972ae0/84255121724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b5825f-1347-4111-a99f-fccb8344d32d/fulosilulaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/464fa4c3-ab42-482a-a512-633a8caafa32/19683990939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd991422-a3e1-4cf2-bd81-8c72e5dbf959/during_depolarization_the_inside_of_the_neurons_membrane_becomes_less_negative.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 3960 bytes
SHA-256: 80a1f5f73402c970fb40a73b0265e6aa41dc21e8c1a7d3d842347b82de0da3e7
font_01_sfnt_off0000de9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9C 5220 bytes
SHA-256: 165ff524bf0b05788758b1b321e39ad4d2612f7be8f1e16febadeb47c14f5f2e
font_02_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 13540 bytes
SHA-256: 8489d0bb27725f22e6f296f8da4b2c54ba8cc0dc4b78fb430d8f9019dfa50d02

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