Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e0f2b862af0b803…

MALICIOUS

PDF

80.4 KB Created: 2021-04-09 21:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a706f51478057c84f5f001c81f920e65 SHA-1: eeb04a36d8174596684af40d85e708358b1d5f69 SHA-256: 3e0f2b862af0b803a0ccea135a03b086a99b92124c0497171060f261bd93009a
184 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and likely phishing-related. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to business audits, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+do+an+internal+audit+of+company In PDF document text
    • http://figupatofewox.iblogger.org/20265454742.pdfIn PDF document text
    • http://golosa-spasibo.ru/formatos_para_reportes_gerencialesrqbh0.pdfIn PDF document text
    • http://vejawezodasupax.22web.org/46705195538.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://brumbum6.xyz/how_to_make_a_claim_on_lloyds_phone_insuranceo64bo.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://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_5b6be6b542134151a6d682927a492ff1.pdf?index=trueIn PDF document text
    • http://bibuxidon.rf.gd/bloodlines_book_1.pdfIn PDF document text
    • http://sutejapikomi.epizy.com/line_6_pocket_pod_presets_download.pdfIn PDF document text
    • http://lelekon.epizy.com/mafatusimageta.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_0225770e66774cf1bfee7a9a88c92530.pdf?index=trueIn PDF document text
    • http://ninonasoligu.rf.gd/star_ocean_integrity_and_faithlessness_strategy_guide.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_ab57cfb03898460ab4706c19552f9c6d.pdf?index=trueIn PDF document text
    • https://3c3a732a-bc26-4be5-bc29-345d3dbc3408.filesusr.com/ugd/63a963_f08c72adce5443d19ce89a1ddda514ad.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_8e3a488ac18e4253b2fdd4dd32fe1ba1.pdf?index=trueIn PDF document text
    • https://b23ebcb4-2e41-4c68-a408-584c84124782.filesusr.com/ugd/5a2446_99be44ab259b4762b32fb601ed461964.pdf?index=trueIn PDF document text
    • http://xowevabi.epizy.com/arifureta_light_novel_volume_5.pdfIn PDF document text
    • http://bulofowomogi.epizy.com/tufinikimuwuperojufo.pdfIn PDF document text
    • http://begilokikilox.rf.gd/42069129023.pdfIn PDF document text
    • http://kagusamijutobal.rf.gd/57132147015.pdfIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_ce17a94e75dd4b5d86b314fc28c508fc.pdf?index=trueIn PDF document text
    • http://robowogutalopet.epizy.com/comtrend_ar_5319_turn_on_wifi.pdfIn PDF document text
    • http://muxawij.rf.gd/apocalypse_now_redux_imdb_parents_guide.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_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 5160 bytes
SHA-256: fb47cdb8f6fbdfc6ef329f0442096559ff30dc47ffc4fcb4e10c2ef0d1794098
font_01_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10600 bytes
SHA-256: 3f438de5382e3140817115a09b1eff842e6ff663e658006e854a475cad1b6f87
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361