Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fdeee47d206926…

MALICIOUS

PDF

78.0 KB Created: 2021-02-15 05:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ba01e2a28b9a431cd68bf7095c0d3604 SHA-1: 6bfc5697d6feeedc5d9ee1517ce293dc9a4cf041 SHA-256: 85fdeee47d206926b33ab8b936db089d6cc31126b0ccea9b03341da9c6ef5f08
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. 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 an academic calendar, a common tactic for phishing or malware delivery. The presence of multiple links on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=uva+law+academic+calendar+2020 In PDF document text
    • https://kuvenamowafave.weebly.com/uploads/1/3/1/3/131379608/zezugen_xulitewav_zowinemepexuge_lefez.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/jhgMoPf/the_cw_channel.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/2215907.pdfIn PDF document text
    • http://organic-ita.space/52273618182hbhwv.pdfIn PDF document text
    • http://esagafow.fun/bncc_histria_resumonm9r6.pdfIn PDF document text
    • http://regvoolkim.website/safukop4n0u.pdfIn PDF document text
    • http://natgood.space/car_crashes_news_reports2t48d.pdfIn PDF document text
    • https://jegupifak.weebly.com/uploads/1/3/4/0/134018348/8229008.pdfIn PDF document text
    • https://cdn.sqhk.co/nubenirosife/fr2bjbB/best_photo_collage_editor_for_pc.pdfIn PDF document text
    • https://tamosumedov.weebly.com/uploads/1/3/4/0/134017363/maregegam.pdfIn PDF document text
    • http://olx-delivery.cc/gibazupt5146.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/jdHmXij/72615147450.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/UWvIHie/58273137745.pdfIn PDF document text
    • http://nafuvexozoli.iblogger.org/atlas_air_compressor_manual.pdfIn PDF document text
    • http://winoraama.website/undyne_fight_simulatormabn8.pdfIn PDF document text
    • http://in-step.shop/business_intelligence_analytics_and_data_science_ramesh_sharda2r9i6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vojilub.rf.gd/98055407752.pdfIn PDF document text
    • http://sivonimowonaze.rf.gd/38881856928.pdfIn PDF document text
    • http://mevonaku.rf.gd/intracerebral_hemorrhage_guidelines_2017.pdfIn PDF document text
    • http://tupusivamiguta.rf.gd/google_voice_assistant_for_pc.pdfIn PDF document text
    • http://tolamepaduxeju.rf.gd/74530481745.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 5324 bytes
SHA-256: 0783b2fd543b15a5926fae7aa2b2c5fb1083779d7efb0abf70a09010901b8267
font_01_sfnt_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A8 10376 bytes
SHA-256: fc135127b2912d670bca5072d66661a4efa3a714663edd8e090923eecb7f312c
font_03_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15