Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f978b38f0bd33c4…

MALICIOUS

PDF

71.8 KB Created: 2021-03-08 18:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: aeddd22e6ce2a627a58e5e12d88f12c1 SHA-1: de31b642846153fb2c44b938767e3f39dbf7fd55 SHA-256: 0f978b38f0bd33c43643863ddcbc7057f68a80c72a9de499a6d2620752d67ad5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/award?keyword=the+lost+world+by+arthur+conan+doyle+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/wusakituzu/hiAqnia/era_of_celestials_mod_apk.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/second_grade_spelling_worksheets.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/intermezzo_cavalleria_rusticana_sheet_music.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/16691169068.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/advanced_players_guide_pathfinder.pdfIn PDF document text
    • https://cdn.sqhk.co/sufokorume/hcjeghI/water_pipes_smoking.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
    • http://maviwapas.epizy.com/sorirapuraredixalovuf.pdfIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_01e999838c884dbc81577965b143aa24.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_3b5f05bcd10c4f119ae6252959e53317.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_17614d2b239347c38642356ab477214e.pdf?index=trueIn PDF document text
    • http://livodubudo.rf.gd/19972596640.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_30004de50da1464e92f7d98075b95210.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d0c903-61c7-471d-8347-4055b99e48ba/39434622939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e62ff599-2de4-4205-add4-ccd7e300ffdc/hoover_vacuum_belt_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f88abe-03fb-4069-bbf4-3fec9be04500/what_does_e3_code_mean_on_power_pressure_cooker.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_off0000cf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF87 5360 bytes
SHA-256: 941a1e0bdb2f0e25adad0de161338e53b9d18560e8affb64d724e7a4c2d96cec
font_01_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 9944 bytes
SHA-256: 40c158616e331221885923dafdd81d1580aa9110ff03573a2f2784123bb7e2b5
font_02_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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