Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3fae5d85694d84…

MALICIOUS

PDF

78.3 KB Created: 2021-06-02 07:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 51b6d2648cade14918ae6ca6d63c5c82 SHA-1: 87b4f3675a2692f642625b382e2a15f90d585d87 SHA-256: eb3fae5d85694d84cd50e73daa6525a30963d30e8814331a56946473028fcc87
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 services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is 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://oniceh.ru/pbw?utm_term=manual+para+extensiones+de+pesta%25C3%25B1as+pdf PDF link annotation
    • https://ponuxarazuzega.weebly.com/uploads/1/3/5/3/135328107/cb8aea5f025.pdfIn PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/sutatunevibapepoza.pdfIn PDF document text
    • https://pezobarifad.weebly.com/uploads/1/3/5/3/135394950/3972381.pdfIn PDF document text
    • https://gakefutafo.weebly.com/uploads/1/3/0/7/130739004/fd4bfa4c7dd.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/4457172.pdfIn PDF document text
    • https://wuziwewaramided.weebly.com/uploads/1/3/4/3/134311070/5702552.pdfIn PDF document text
    • https://diwirutug.weebly.com/uploads/1/3/4/3/134387727/2573e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c4adfa94-be69-4cb7-8d1a-ceb567b9ade2/87590524758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9437eee7-b657-4c99-9df1-0063ba54cf64/jogemowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc16296-3cc5-4ad6-9b37-b79cac65c8b5/bise_lahore_9th_class_result_2020_gazette_download.pdfIn PDF document text
    • http://jizakatum.pbworks.com/w/file/fetch/144490497/test_for_following_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/821e973e-6af3-4506-bc5e-04bcf35508d8/kaxidomivubosivutibar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e1b66de-6ee9-492d-b831-8ed917201688/juvabobajojevufopog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084cbaf0-2343-4f9d-94d0-3fd1dc80a767/what_are_the_codes_for_element_tv.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/vukusotimoralowu.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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 5204 bytes
SHA-256: 27b2b2be48b6753b7bcc9bc046fae154ce82a04a5e5beeac19459fdbac7d0fec
font_01_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 12796 bytes
SHA-256: 6c124e6b7f4110eb90d88bdb17b1f222bd214d195fd3e9197aa388ed5685bf79
font_02_sfnt_off00011bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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