Malicious PDF — malware analysis report

Static analysis result for SHA-256 721dbf2f3841a252…

MALICIOUS

PDF

76.7 KB Created: 2021-03-25 06:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7b27b13d06342c9a1b3088bf3586e427 SHA-1: be3aa70a595183b5129e29234a9a041fce51028b SHA-256: 721dbf2f3841a2521c16f9d57b24a7bc732bf9ed6bd77ec146df0bd2579b25c1
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, 'https://dugedepap.ru/award?keyword=logo+centro+democratico+pdf', is presented as a search result, likely to direct users to malicious or phishing content. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

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://dugedepap.ru/award?keyword=logo+centro+democratico+pdf PDF link annotation
    • https://cdn.sqhk.co/sewadokoka/ieOjbjb/best_ice_crushing_blender_uk.pdfIn PDF document text
    • http://bapadama.medianewsonline.com/gilimudikagupew.pdfIn PDF document text
    • http://lirudizulizi.iblogger.org/tozadajazujogog.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/pijabozufegilejemiwubulam.pdfIn PDF document text
    • http://xapozibun.22web.org/construction_health_and_safety_plan_template.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/jboBOa9/piano_tiles_2_apk_2015.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://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_de22c9e3e7bc415da2a18e53b904185c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ecdbb4f-0b2a-4c98-91fb-4d9e3527bf26/why_my_whirlpool_dishwasher_wont_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be099196-0bec-4748-ac1b-3ba3a69eec4a/algorithms_in_a_nutshell_2nd_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4355e9-627d-44c9-87f3-e36cff1a0b54/history_of_sexuality_volume_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0742bb7b-8e3b-489b-a86a-14577450782b/xuxovenixa.pdfIn PDF document text
    • http://namifaku.epizy.com/medicare_part_d_formulary_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f56c443d-84d2-45e0-ae9c-5813437d5b27/nosomogaxulezuzugexawedom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1703598-5980-4926-b2e1-bf2cbd7e901e/75640505695.pdfIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_f8a7eadf5add498d9f8f947611e22e78.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_88094ebb361a4ebab463752393975966.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88ca1f5-059f-4366-92f5-9641b0289f1f/dbt_worksheets_emotion_regulation.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_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 4996 bytes
SHA-256: 8a3f012312d1f50828dfd54a03ab33eb494924ebe1ff53c1db8d51fc4923db7a
font_01_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 12520 bytes
SHA-256: edea274d26843b9f2f53dae237d4fafa31ed4ac3e61d1859423f81063f5b111d
font_02_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34