Malicious PDF — malware analysis report

Static analysis result for SHA-256 460b55d0f5ee26f1…

MALICIOUS

PDF

82.4 KB Created: 2021-03-02 05:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 528cf08427a7d1c4005ad1e90f195613 SHA-1: 236c43dac79fa1f4087795fc0eac5e57b5af65de SHA-256: 460b55d0f5ee26f123a14c3f995207f48e1aebae1afdd24204f92750d1532fca
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to downloads and applications, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites.

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
  • 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://crophysi.ru/strik?utm_term=sims+3+sunset+valley+makeover+download In PDF document text
    • http://istra-backwater.ru/why_is_my_kenmore_refrigerator_not_coldau8ey.pdfIn PDF document text
    • http://lisulav.iblogger.org/kikulitado.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/fofedikamubelamarupefove.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/75521949548.pdfIn PDF document text
    • http://llloooodddd.space/instrumen_akreditasi_puskesmas_2018okjc2.pdfIn PDF document text
    • http://tesocoin.online/641944953956dd80.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xewepipesu.epizy.com/arista_7130l_datasheet.pdfIn PDF document text
    • http://bogibil.rf.gd/donation_request_letter_template_baseball_team.pdfIn PDF document text
    • http://denefarow.rf.gd/beyond_the_blackboard_full_movie.pdfIn PDF document text
    • http://jejafajiw.rf.gd/nautical_baby_shower_invitation_template.pdfIn PDF document text
    • http://numekup.epizy.com/english_text_book_10th_class.pdfIn PDF document text
    • http://wivufaw.epizy.com/american_music_awards_2017_shawn_mendes_performance.pdfIn PDF document text
    • http://datonojafasaxup.rf.gd/rasedikobepenefemoporati.pdfIn PDF document text
    • http://tirevotijo.epizy.com/midamem.pdfIn PDF document text
    • http://vixadit.rf.gd/ranuxurexuvezen.pdfIn PDF document text
    • http://dowomux.rf.gd/who_discovered_static_electricity_first.pdfIn PDF document text
    • http://gafamiziwadi.rf.gd/android_canvas_clear_all.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 5556 bytes
SHA-256: 39c38a606d353111f87cd8ff2ddc6d10518e227a11467cc16bf4e9048fd9e36d
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 11180 bytes
SHA-256: 3ef6371920e85630df3625170801794a936f4786ec49c48663e9bac53b7285d7
font_02_sfnt_off000126b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B2 16144 bytes
SHA-256: f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d

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