Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63d00a4a90b8c8b…

MALICIOUS

PDF

77.7 KB Created: 2021-02-28 09:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f855d2b653a24d5134da827afe868ed4 SHA-1: 1d48dfa0dcefe89558c51961542a93999e245a1a SHA-256: f63d00a4a90b8c8b133a5b86fa7def91f94cf13e7b24e0d1683c9f9f79df1070
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to potentially malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish for credentials or deliver further malware. No scripts were extracted, but the primary attack vector appears to be the embedded links.

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/wix?keyword=cold+war+worksheets+middle+school In PDF document text
    • http://fumexijana.getenjoyment.net/microsoft_office_table_of_contents_tutorial.pdfIn PDF document text
    • http://taxokijoba.sportsontheweb.net/bose_companion_3_stopped_working.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/what_does_community_development_and_social_work_entail.pdfIn PDF document text
    • http://jonebukusopovet.mygamesonline.org/tajurod.pdfIn PDF document text
    • http://pifedalune.medianewsonline.com/mouse_guard_gameplay.pdfIn PDF document text
    • http://sunshop.pro/tosexexuxupojunekuxazqv43w.pdfIn PDF document text
    • http://vatidenow.medianewsonline.com/how_to_make_your_own_screens_for_windows.pdfIn PDF document text
    • http://goxezidoge.22web.org/hand_quilting_stitch_templates.pdfIn PDF document text
    • http://circus.market/483078621192e2n6.pdfIn PDF document text
    • http://austritkfa.com/adobe_flash_player_11._5_offlinertjfa.pdfIn PDF document text
    • http://verification-help.com/bubble_answer_sheet_1-_100_a-_eyb06a.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/31496925192.pdfIn PDF document text
    • http://meetraisins.club/5061828778w3bgs.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/kigozesujubibiterojogekur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kepofif.onlinewebshop.net/vazuv.pdfIn PDF document text
    • http://vosolapigufax.epizy.com/7546005966.pdfIn PDF document text
    • http://vipotunopadilez.rf.gd/moramefu.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/informational_text_types_worksheet.pdfIn PDF document text
    • http://gunijeru.rf.gd/24703904981.pdfIn PDF document text
    • http://sitafefisoju.atwebpages.com/nexus_mods_fallout_4_mod_configuration_menu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 5240 bytes
SHA-256: a033382a2e32b5680a13cd02176279107bd6add927eee6d812b39b10d58fa910
font_01_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 10428 bytes
SHA-256: 598326919f8f8016633059e0092810d62e1d514d693de1cfb9558c1dc759bd6c

Open this report in the interactive analyzer, or submit your own file for analysis.