Malicious PDF — malware analysis report

Static analysis result for SHA-256 722322fbffac483e…

MALICIOUS

PDF

91.2 KB Created: 2021-05-21 19:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 003a8fb90397206dab29babbf53db46b SHA-1: 063bb15ee5fc39ab9b527d49a3ab602945eed3d8 SHA-256: 722322fbffac483ea9ce82e2385b9c787c7edc0b3fb87a270dce5f77b058bd90
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bipuvoru.weebly.com/uploads/1/3/5/3/135336843/dipip.pdf In PDF document text
    • https://buginibonimej.weebly.com/uploads/1/3/2/7/132711973/4cf3cf8b5a58f2.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/07f013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_603f3e757be0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408464/normal_5fe83f7bc8140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445107/normal_6067f84d71034.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463010/normal_5fe382b78e734.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/4435088.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368474/normal_601f1c1474f66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_6065455b6fe3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_600ea6c6a8e01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469119/normal_600d32f0b7e52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_6022d1a2884d5.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/valulugizuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462345/normal_5fffb95dd5e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480732/normal_6014cb0613bf8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/KjdSuPfhPRY/wb?keyword=data%20mining%20definition%20in%20computer%20sciencePDF link annotation
    • https://uploads.strikinglycdn.com/files/ed37ac50-50ac-446a-8ebf-60a9a4b08bd8/what_type_of_bond_is_potassium_nitrate_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbf93d33-7289-4218-b175-dbc7526bd370/how_to_use_an_amazon_echo_as_a_bluetooth_speaker_with_your_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f590c118-daa5-45f4-942c-b2a55766a89c/weight_watchers_scale_manual_ww52.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec8558c-f893-438b-a43e-cbb1fa44a1dc/asus_p8z77-v_memory_compatibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b99873-2c8b-4abf-96d0-6d9fd24b9f4b/8812926248.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_off00012268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 5440 bytes
SHA-256: 5c26e8e27745e1137dc62457155cd3a2b196be397364571df2c3bdc24d4b4c77
font_01_sfnt_off000134e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134E2 12136 bytes
SHA-256: de67e2b2a11c3279cc6db94c26743e6adeb448414b6a6d698faa2b3ffc3735c8