Malicious PDF — malware analysis report

Static analysis result for SHA-256 8789f4ebfaae0d86…

MALICIOUS

PDF

74.8 KB Created: 2021-04-15 18:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2bab0f05c870492f5bae026b84b676d1 SHA-1: 0f7e94cbfc26f0cd3d7e295da898fe51869b5dba SHA-256: 8789f4ebfaae0d86610d35c72512213f959364e0871cf8f42132e638b69209d1
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to exploit users by directing them to external, untrusted websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://kuzutuzo.ru/strik?utm_term=best+projects+with+arduino+uno PDF link annotation
    • http://vasazuruxu.iblogger.org/allowance_budget_worksheet.pdfIn PDF document text
    • https://nobujowufovipi.weebly.com/uploads/1/3/4/6/134636268/75a2613937760.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_5fd28a064c2c2.pdfIn PDF document text
    • https://gigatadozewat.weebly.com/uploads/1/3/1/6/131606492/galuvajiwu.pdfIn PDF document text
    • http://mezunirobuf.22web.org/que_medios_de_comunicacion_existen_en_colombia.pdfIn PDF document text
    • https://jetabasujupeg.weebly.com/uploads/1/3/4/7/134703241/0166d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fe4167332b3b.pdfIn PDF document text
    • https://lugijuvumefabi.weebly.com/uploads/1/3/4/7/134761930/cf38f47ac3e1.pdfIn PDF document text
    • http://sovetnik53.ru/xewefisaturidowmdfk.pdfIn PDF document text
    • http://toppiksnack.xyz/when_did_a_river_runs_through_it_come_outoo8rk.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/3275009.pdfIn PDF document text
    • http://classkaod.ru/filleted_accounts_directors_report6rquj.pdfIn PDF document text
    • http://sojuvofud.22web.org/caryl_churchill_biography.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373997/normal_5fe38a100430e.pdfIn PDF document text
    • http://studytogether.fun/cosmos_neil_degrasse_tyson_capitulo_1_latinohi9is.pdfIn PDF document text
    • http://gokuluzed.iblogger.org/1_week_calendar_template_excel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://goriliximawux.rf.gd/17126241091.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_8e35b990fa3d494793d141db7c84b650.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_76dc324f4f724ba39d5b8b869dd309c2.pdf?index=trueIn PDF document text
    • http://jegowijuvu.epizy.com/kirefutid.pdfIn PDF document text
    • http://zifiwek.rf.gd/according_to_the_visual_cues_lecture_what_is_the_most_dynamic_and_active_of_shapes.pdfIn PDF document text
    • http://wagovadi.rf.gd/52871269727.pdfIn PDF document text
    • http://zunimesigo.rf.gd/apple_watch_apps_not_ing.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_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 5344 bytes
SHA-256: 9484eec076fcb0f65fe07e421fe9be5aa9d9a7f21637ada7c601dfa648378407
font_01_sfnt_off0000f6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C8 11416 bytes
SHA-256: f8b70447659551fb93f16255cd9a9f2c6cad52bdef8d5dd99c708a9712927893

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