Malicious PDF — malware analysis report

Static analysis result for SHA-256 a737b60c2e2cf1c6…

MALICIOUS

PDF

76.2 KB Created: 2021-04-25 21:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 35b4bd4ecec49935385495110cb98e0d SHA-1: 227aa2a02f7ecbbcd5c356642c1b88eafd0ab2f6 SHA-256: a737b60c2e2cf1c6fbd8378bb20947f0bd03091250ff43dd9ebc94e7e85bc2b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=media+visual+codes PDF link annotation
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/jozopane-puwagowokifuzaz-baginuko-womokilirat.pdfIn PDF document text
    • http://verifybadgehelp.com/what_is_the_algorithm_to_solving_a_rubiks_cubeg1qb6.pdfIn PDF document text
    • https://gadebalemalun.weebly.com/uploads/1/3/4/4/134443756/633b5aab64f344f.pdfIn PDF document text
    • https://tabekemaw.weebly.com/uploads/1/3/0/8/130874329/7233941.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/pay_slip_download.pdfIn PDF document text
    • http://copyrightnotices-form.com/cavatina_piano_music3648n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381102/normal_603b099a48dbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_5fe845227b39c.pdfIn PDF document text
    • http://wiinorama.space/pw_atkins_physical_chemistry_download0mocx.pdfIn PDF document text
    • http://policyhelpcenter.com/a_b_c_d_rhymestbslt.pdfIn PDF document text
    • http://ruvujagefeko.mygamesonline.org/jepazotelazowuwuju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5feb37284d00a.pdfIn PDF document text
    • http://malespw.xyz/gulidejavnkc6x.pdfIn PDF document text
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/556cb9ab.pdfIn PDF document text
    • https://redorofi.weebly.com/uploads/1/3/5/3/135383823/sufusitud_texeropidokated.pdfIn PDF document text
    • http://sozawakofuriwoj.getenjoyment.net/38923438093.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/icebreakers_for_kids_online.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/zomujidifolenusovowat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xotopusedewix.myartsonline.com/icc_cricket_score_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/10418574838.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/printable_newsletter_templates_for_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/migevikile.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_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 4904 bytes
SHA-256: f00adda0fdc2b1816b057ad2452790a18748855318d0d4189ffe6238631dc44c
font_01_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 10712 bytes
SHA-256: f3c7ba16d794e2adebacc20f9490b541de28f0dc417e7a94efb361fc60e34d93

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