Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43f74bc3a103ed3…

MALICIOUS

PDF

93.7 KB Created: 2021-04-03 10:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 25bc886db8a16e0d16bd4181e346b4aa SHA-1: 57650549247a7e41d5858fd2b7fe48b900df2e3d SHA-256: e43f74bc3a103ed3fbf2ec224fafa75c065b721c4c842211997d2d6b7e0ff7fd
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 external links, many hosted on disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/award?keyword=acer+nitro+5+specs+pdf PDF link annotation
    • https://bewimowijukoja.weebly.com/uploads/1/3/4/5/134584545/8801800.pdfIn PDF document text
    • http://tadurarawi.mypressonline.com/zogamaxilogirupelo.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/338708.pdfIn PDF document text
    • http://lirituniwati.22web.org/91472043636.pdfIn PDF document text
    • http://autocredit.moscow/23905201541ic1zt.pdfIn PDF document text
    • http://uorott.com/nj_transit_bus_schedule_freehold_to_asbury_parki2il5.pdfIn PDF document text
    • http://retys.space/xinewurekuod2gv.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/napozen.pdfIn PDF document text
    • http://help-business-media.com/how_to_connect_presonus_to_ipad91q7g.pdfIn PDF document text
    • http://farilanij.iblogger.org/pmbok_guide_6th_edition_free_download.pdfIn PDF document text
    • https://bozaxemavokasum.weebly.com/uploads/1/3/1/3/131383719/xipokekarirege.pdfIn PDF document text
    • https://xegokefizu.weebly.com/uploads/1/3/5/3/135323464/6737037.pdfIn PDF document text
    • http://dadivasim.sportsontheweb.net/66373663893.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/540d2bd4-73ed-4b70-9cca-63ac015b9701/why_is_my_new_dishwasher_not_drying.pdfIn PDF document text
    • http://fasadokejofis.epizy.com/norinutaziledatevod.pdfIn PDF document text
    • http://wojobawezelo.rf.gd/electronics_and_communication_interview_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcce117d-65db-4843-b7a2-ebd1c0e4e10f/finnegans_wake_lyrics.pdfIn PDF document text
    • http://widepidaba.atwebpages.com/11661480324.pdfIn PDF document text
    • http://nabukewegurizev.rf.gd/grundig_satellit_750_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f65e72c-b502-40a1-af9a-e1028ffe3222/how_to_learn_forex_trading_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3eaf4e9-da18-4342-80ba-1f01471945d1/air_conditioning_troubleshooting_guide.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_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 5020 bytes
SHA-256: be89797b8d81cabd945fe3c306c89c1d9a17da9baf9e13600a727e481f76481a
font_01_sfnt_off0001299b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299B 11848 bytes
SHA-256: 0a771fdc8932dc860a546873e793077b61d706e68d67e35cb3c8e077b8593098
font_02_sfnt_off0001521f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521F 16224 bytes
SHA-256: 0a7b6b2f42a365697c51a9d52f67a20cff6f5104471c358864038bb2fc7d6e39

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