Malicious PDF — malware analysis report

Static analysis result for SHA-256 023a3bcb96b78bde…

MALICIOUS

PDF

83.5 KB Created: 2021-03-29 18:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad2f307df770a975d2b73ac435afa5b3 SHA-1: ca45b482c58fe101cd3c36694093d182961ad8e0 SHA-256: 023a3bcb96b78bded83b6f69f6db23b1c59be8d27931f292da9f42369ff8562d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=shrek+movie+collection+in+tamil PDF link annotation
    • http://sekuweb.iblogger.org/south_australian_spelling_test.pdfIn PDF document text
    • https://sotoxitubomiv.weebly.com/uploads/1/3/2/6/132695919/a68c2c22.pdfIn PDF document text
    • https://koralazuvumo.weebly.com/uploads/1/3/1/8/131871516/2781927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457839/normal_604891d4e419f.pdfIn PDF document text
    • http://my-favshopg.online/is_health_o_meter_scale_accuratewtx7x.pdfIn PDF document text
    • https://beserozufem.weebly.com/uploads/1/3/4/8/134864657/1574609.pdfIn PDF document text
    • http://wopexobow.mywebcommunity.org/hp_8625_ink.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444370/normal_5fcb3954e4f1d.pdfIn PDF document text
    • http://connexion-amelii.xyz/dezexerasoboporugskfyn.pdfIn PDF document text
    • http://slamelina.website/325110565559yr9o.pdfIn PDF document text
    • http://azakalaza3.xyz/the_danger_of_a_single_story_igcse_questionsa44i0.pdfIn PDF document text
    • http://s7hmus.org/harmony_650_instructions0vja0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_60124090bd4ed.pdfIn PDF document text
    • http://thailandlove.site/ejemplos_de_monografas_universitarias17p04.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/empathic_listening.pdfIn PDF document text
    • http://b4shop.icu/how_to_balancing_chemical_equations_practicemrpml.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5fe92543d48e7.pdfIn PDF document text
    • http://216tilford.com/18563030946rzd1o.pdfIn PDF document text
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/nopafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412154/normal_600669635d9a2.pdfIn PDF document text
    • http://dabopoxele.getenjoyment.net/calligraphy_classes_fees.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fijorolur.myartsonline.com/public_speaking_coaching_near_me.pdfIn PDF document text
    • http://pefutofoxuraz.rf.gd/arduino_uno_wifi_shield_not_present.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f6b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF6B3 14408 bytes
SHA-256: a5e8ed480737faef0d1450050239593e923273bb0cb1acb6960136d449844143
font_00_sfnt_off0000e58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58C 5088 bytes
SHA-256: d896bac1fcb93672600253b195453f830c2665df9fc8dde356a68255abaf43d3
font_02_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 11176 bytes
SHA-256: 287c70a71b357bbebcf027864f75f7b568ca09537bbeaeb31f3cdc8a8eb0114a

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