Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a963ac562e38bb4…

MALICIOUS

PDF

77.9 KB Created: 2021-03-30 19:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 71b7b89b18ba1f9d263e4781028e5dc2 SHA-1: 0f5d11eabcd816ed2879430bcfe667338f8704b2 SHA-256: 3a963ac562e38bb41fef9fa9f66a82169b6c29f89f2c411b4d577c46953d7b1f
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous external URLs pointing to other PDFs hosted on disposable domains and file-sharing services. The primary purpose appears to be directing users to potentially malicious or phishing content, leveraging the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/award?keyword=water+cycle+process+pdf PDF link annotation
    • http://ruloposozaxekon.iblogger.org/livetero.pdfIn PDF document text
    • http://zoluwofemofuper.sportsontheweb.net/80432948050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455196/normal_6046052eca76a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379601/normal_60243bcbf01fb.pdfIn PDF document text
    • http://vomidujoma.scienceontheweb.net/business_development_manager_job_description_sample.pdfIn PDF document text
    • http://kozovuxe.22web.org/50821710157.pdfIn PDF document text
    • http://jakugurotugalow.22web.org/kitisonafa.pdfIn PDF document text
    • http://sulelufisumi.iblogger.org/vusozesirizesenutibud.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/77110062014.pdfIn PDF document text
    • http://dasuwupozu.22web.org/slide_ppt_pendidikan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fcf1b47948c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_a11cb422a57f4d5094262503f4ef18a7.pdf?index=trueIn PDF document text
    • http://dufuvebali.rf.gd/curse_of_strahd_campaign_guide.pdfIn PDF document text
    • http://mifinuxob.epizy.com/3m_safety_glasses_prescription_frames.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_d8329b322654478fa9229d1ffb1e0344.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_bb67fc8fe63b4c9e93af6d6887b0ea0f.pdf?index=trueIn PDF document text
    • http://pusaxedufa.rf.gd/bexigulufara.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_1f44cc4fe33845378e087128ecd130b1.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_79775cad7a87490db570e4d98271dab8.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_374f6d4a52be43d386033bab969141a5.pdf?index=trueIn PDF document text
    • http://zusaxadixuxot.myartsonline.com/53841970442.pdfIn PDF document text
    • http://zutaturusix.myartsonline.com/vedefiro.pdfIn PDF document text
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_8903a12bfd284f7793c0a537b35da3c8.pdf?index=trueIn PDF document text
    • http://pufupivati.epizy.com/think_like_a_freak_book_review.pdfIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_5447b91838654e049e746fed5b753a0b.pdf?index=trueIn 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_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 5264 bytes
SHA-256: c4347a9d91ea5845847e01b55189f2798eec22221078c11c6a42629f13813f3d
font_01_sfnt_off00010585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10585 10784 bytes
SHA-256: 5e41722b80f3a3e396bed82a649cdc73ca0eb19f0e1cfa6253000a2bf206f3c5