Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff33831c26feeb12…

MALICIOUS

PDF

66.7 KB Created: 2021-03-15 13:48:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6b61ab9705b0f4ed9e86f16166aa0fd1 SHA-1: 0eb77f36972780a12076d097596ed7e9a0c937cf SHA-256: ff33831c26feeb127ed0a90d3295c8ce7e88b83b8ade1ecc51618646830b29c6
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=glastonbury+high+school+athletics+twitter PDF link annotation
    • http://smartcreditscore.info/absalom_absalom_william_faulkner_summary816d6.pdfIn PDF document text
    • http://pro-komp-master.website/913917508199qyd2.pdfIn PDF document text
    • http://energytik.net/vuzamid791r.pdfIn PDF document text
    • http://kapusta.pro/soy_milk_production3639j.pdfIn PDF document text
    • https://cdn.sqhk.co/sulugedako/bvUjk9S/nujesegozidafomutabakem.pdfIn PDF document text
    • http://fragcups.com/rozikoxumnjxdp.pdfIn PDF document text
    • http://smotrikino.fun/sekowiwcqdaj.pdfIn PDF document text
    • http://ashotik.space/kozuwuliridobw5fmq.pdfIn PDF document text
    • https://cdn.sqhk.co/peretudiwi/iesuwic/avalara_tax_rates.pdfIn PDF document text
    • http://idealica-italy.site/44806290433608dx.pdfIn PDF document text
    • https://rujemezemomiwo.weebly.com/uploads/1/3/0/9/130969750/3608837.pdfIn PDF document text
    • https://rasajelisulozin.weebly.com/uploads/1/3/1/6/131637016/348275.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/what_is_importance_of_energy_conversion.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/FzgfPwQ/std_10_result_2020_check_online.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/dazegogarobixavul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://senesijosezetu.myartsonline.com/principles_of_molecular_virology_book.pdfIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_01bbe6c13532481b8ffa2023b7b690d2.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_58a00dcf38384abc9d11317c0a5f0379.pdf?index=trueIn PDF document text
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_c59d2809f0ae41399dbfcf99de76d22d.pdf?index=trueIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/penguin_readers_free_download.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_8d44ec399c354f3f90ddec6330e520d7.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_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 5428 bytes
SHA-256: 9986d01978dcd8497c16fb2e11730d91aba68a038410816878de5f25e2a43959
font_01_sfnt_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 9148 bytes
SHA-256: 5fe81b02316a4baf7d4aa6aee80930dcc7671532b087dbbd22551905b7d41136

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