Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16363839fc0bf60…

MALICIOUS

PDF

83.0 KB Created: 2021-04-02 10:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: baaff043813649e3c4db924f877005d4 SHA-1: ff842a82c4e73ecf3967722aa5bdf859849ea947 SHA-256: a16363839fc0bf60300b88716f8b6dd1908b2677c2819bcc82b79884b5aa511f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to redirect users to potentially malicious sites. The embedded URLs and the document's structure point towards an attempt to disguise malicious activity as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jottigo.ru/strik?utm_term=what+is+a+masters+in+educational+psychology PDF link annotation
    • http://wudebakafepi.mypressonline.com/ap_human_geography_unit_1_basic_concepts.pdfIn PDF document text
    • https://geruzusuvar.weebly.com/uploads/1/3/0/7/130776720/89db5b1f.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/puderuji.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/ac_dc_power_supply_design.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/7059784583870wsv.pdfIn PDF document text
    • http://terugate.mypressonline.com/aditya_hridaya_stotra_free_download.pdfIn PDF document text
    • https://sibetufubexab.weebly.com/uploads/1/3/2/7/132712005/nisomu.pdfIn PDF document text
    • http://menbp.online/outlander_book_1_hardcoverjin6o.pdfIn PDF document text
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/fovigonumubulo.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/sobiraliwe.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/22187431241.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/guba_and_lincoln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jekurur.atwebpages.com/80064836055.pdfIn PDF document text
    • https://bad3f395-1638-4667-b349-d6f934eeab49.filesusr.com/ugd/ed2d23_6dd68357c16f4bcd8c625b5b50fcc2ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08f3a4b-f1dd-450a-802d-080b1e2c7080/peweximukupirajora.pdfIn PDF document text
    • https://c8019651-2137-4367-b38e-775fff3f8a75.filesusr.com/ugd/fc5a02_896ee024804b49e79d1ce9051498faef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4bd538a-aa74-40f0-9d10-49244a9ab610/33057141325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff5c1e7-2a3a-4dd7-9d57-2295184fc407/89989714170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/221924b5-9208-4f1b-94c0-d6784d889355/85987604158.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/odisha_govt_holiday_list_2020.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_973570d2ef4f48feacf1fff336ae8e76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/faf0ec9a-0250-4f45-a0bd-0b94f99002b7/jigewufawewenipisoxoregov.pdfIn PDF document text
    • https://238a82c5-85a8-4641-a991-2f0f5270ddc4.filesusr.com/ugd/63f22d_180b893c14fb4878964ea63785ffcfc1.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_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 5600 bytes
SHA-256: cb7ca389ae64ff08200143efafda72ae75b24c1d9c00bcc03476807edf6a5a02
font_01_sfnt_off00011964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11964 10992 bytes
SHA-256: 9e551e337aeb68f0b78c7ab65a8bd2068f764e5f9b27400663d98326c373d7d9